Use a Steel Boring Bar if you are reaching less than 4X Length to Diameter.  Use a Carbide Boring Bar is you are reaching between 4X to 8X Length to Diameter or if finish is critical. Also, if you have Coolant Thru use it whenever possible. Use Filters on Left to Narrow Down Boring Bar that is the Best Fit for Your Application.
Ultra Dex e08r-sdxcl2 E08R SDXCL2. Arch Part # 920-000-228
Ultra Dex e08r-sdxcl2 E08R SDXCL2. Arch Part # 920-000-228 $ 334.69

E08R SDXCL2 Back Boring Carbide Coolant Thru .720" Min Bore x 1/2" Shank x 8" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex e08j-sdxcr2 E08J SDXCR2. Arch Part # 920-000-192
Ultra Dex e08j-sdxcr2 E08J SDXCR2. Arch Part # 920-000-192 $ 292.36

E08J SDXCR2 Back Boring Carbide Coolant Thru .720" Min Bore x 1/2" Shank x 4.5" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex e08j-sdxcl2 E08J SDXCL2. Arch Part # 920-000-191
Ultra Dex e08j-sdxcl2 E08J SDXCL2. Arch Part # 920-000-191 $ 292.36

E08J SDXCL2 Back Boring Carbide Coolant Thru .720" Min Bore x 1/2" Shank x 4.5" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop

Ultra Dex e06m-sdxcr2 E06M SDXCR2. Arch Part # 920-000-159
Ultra Dex e06m-sdxcr2 E06M SDXCR2. Arch Part # 920-000-159 $ 265.51

E06M SDXCR2 Back Boring Carbide Coolant Thru .585" Min Bore x 3/8" Shank x 6" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex e06m-sdxcl2 E06M SDXCL2. Arch Part # 920-000-158
Ultra Dex e06m-sdxcl2 E06M SDXCL2. Arch Part # 920-000-158 $ 265.51

E06M SDXCL2 Back Boring Carbide Coolant Thru .585" Min Bore x 3/8" Shank x 6" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex c08r-sdxcr2 C08R SDXCR2. Arch Part # 920-000-103
Ultra Dex c08r-sdxcr2 C08R SDXCR2. Arch Part # 920-000-103 $ 319.33

C08R SDXCR2 Back Boring Carbide .720" Min Bore x 1/2" Shank x 8" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop

Ultra Dex c08r-sdxcl2 C08R SDXCL2. Arch Part # 920-000-102
Ultra Dex c08r-sdxcl2 C08R SDXCL2. Arch Part # 920-000-102 $ 319.33

C08R SDXCL2 Back Boring Carbide .720" Min Bore x 1/2" Shank x 8" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex c08j-sdxcr2 C08J SDXCR2. Arch Part # 920-000-071
Ultra Dex c08j-sdxcr2 C08J SDXCR2. Arch Part # 920-000-071 $ 280.86

C08J SDXCR2 Back Boring Carbide .720" Min Bore x 1/2" Shank x 4.5" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex c08j-sdxcl2 C08J SDXCL2. Arch Part # 920-000-070
Ultra Dex c08j-sdxcl2 C08J SDXCL2. Arch Part # 920-000-070 $ 280.86

C08J SDXCL2 Back Boring Carbide .720" Min Bore x 1/2" Shank x 4.5" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop

Ultra Dex c06m-sdxcr2 C06M SDXCR2. Arch Part # 920-000-039
Ultra Dex c06m-sdxcr2 C06M SDXCR2. Arch Part # 920-000-039 $ 241.08

C06M SDXCR2 Back Boring Carbide .585" Min Bore x 3/8" Shank x 6" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex c06m-sdxcl2 C06M SDXCL2. Arch Part # 920-000-038
Ultra Dex c06m-sdxcl2 C06M SDXCL2. Arch Part # 920-000-038 $ 241.08

C06M SDXCL2 Back Boring Carbide .585" Min Bore x 3/8" Shank x 6" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop

Kyocera S16XSDZCR3 Right-Hand, Positive Rake, Boring Bar
Kyocera S16XSDZCR3 Right-Hand, Positive Rake, Boring Bar $ 227.50 $ 256.85

Kyocera S16XSDZCR3 Right-Hand, Positive Rake, General Purpose Boring Bar with 93 Degree Lead Angle and 0.9840" Minimum Bore Dia.

+ Quick Shop

Kyocera S12RSDZCR3 Right-Hand, Positive Rake, Boring Bar
Kyocera S12RSDZCR3 Right-Hand, Positive Rake, Boring Bar $ 209.24 $ 236.24

Kyocera S12RSDZCR3 Right-Hand, Positive Rake, General Purpose Boring Bar with 93 Degree Lead Angle and 0.7870" Minimum Bore Dia.

+ Quick Shop
Kyocera S10XSDZCR2 Right-Hand, Positive Rake, Boring Bar
Kyocera S10XSDZCR2 Right-Hand, Positive Rake, Boring Bar $ 196.87 $ 222.27

Kyocera S10XSDZCR2 Right-Hand, Positive Rake, General Purpose Boring Bar with 93 Degree Lead Angle and 0.6300" Minimum Bore Dia.

+ Quick Shop
Ultra Dex a16x-sdxcr3 A16X SDXCR3. Arch Part # 957-000-163
Ultra Dex a16x-sdxcr3 A16X SDXCR3. Arch Part # 957-000-163 $ 215.29

A16X SDXCR3 Back Boring Steel Coolant Thru 1.310" Min Bore x 1" Shank x 9" OAL RH Boring Bar for DCMT32.5_ Inserts with .250" Offset

+ Quick Shop

Ultra Dex a16x-sdxcl3 A16X SDXCL3. Arch Part # 957-000-162
Ultra Dex a16x-sdxcl3 A16X SDXCL3. Arch Part # 957-000-162 $ 215.29

A16X SDXCL3 Back Boring Steel Coolant Thru 1.310" Min Bore x 1" Shank x 9" OAL LH Boring Bar for DCMT32.5_ Inserts with .250" Offset

+ Quick Shop
Ultra Dex a12q-sdxcr3 A12Q SDXCR3. Arch Part # 957-000-115
Ultra Dex a12q-sdxcr3 A12Q SDXCR3. Arch Part # 957-000-115 $ 164.93

A12Q SDXCR3 Back Boring Steel Coolant Thru 1.050" Min Bore x 3/4" Shank x 7" OAL RH Boring Bar for DCMT32.5_ Inserts with .250" Offset

+ Quick Shop
Ultra Dex a12q-sdxcl3 A12Q SDXCL3. Arch Part # 957-000-114
Ultra Dex a12q-sdxcl3 A12Q SDXCL3. Arch Part # 957-000-114 $ 164.93

A12Q SDXCL3 Back Boring Steel Coolant Thru 1.050" Min Bore x 3/4" Shank x 7" OAL LH Boring Bar for DCMT32.5_ Inserts with .250" Offset

+ Quick Shop

Ultra Dex a10m-sdxcr2 A10M SDXCR2. Arch Part # 957-000-081
Ultra Dex a10m-sdxcr2 A10M SDXCR2. Arch Part # 957-000-081 $ 142.30

A10M SDXCR2 Back Boring Steel Coolant Thru .850" Min Bore x 5/8" Shank x 6" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex a10m-sdxcl2 A10M SDXCL2. Arch Part # 957-000-080
Ultra Dex a10m-sdxcl2 A10M SDXCL2. Arch Part # 957-000-080 $ 142.30

A10M SDXCL2 Back Boring Steel Coolant Thru .850" Min Bore x 5/8" Shank x 6" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex a08m-sdxcr2 A08M SDXCR2. Arch Part # 957-000-062
Ultra Dex a08m-sdxcr2 A08M SDXCR2. Arch Part # 957-000-062 $ 117.12

A08M SDXCR2 Back Boring Steel Coolant Thru .720" Min Bore x 1/2" Shank x 6" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop

Ultra Dex a08m-sdxcl2 A08M SDXCL2. Arch Part # 957-000-061
Ultra Dex a08m-sdxcl2 A08M SDXCL2. Arch Part # 957-000-061 $ 117.12

A08M SDXCL2 Back Boring Steel Coolant Thru .720" Min Bore x 1/2" Shank x 6" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex a06j-sdxcr2 A06J SDXCR2. Arch Part # 957-000-018
Ultra Dex a06j-sdxcr2 A06J SDXCR2. Arch Part # 957-000-018 $ 107.07

A06J SDXCR2 Back Boring Steel Coolant Thru .585" Min Bore x 3/8" Shank x 4.5" OAL RH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop
Ultra Dex a06j-sdxcl2 A06J SDXCL2. Arch Part # 957-000-017
Ultra Dex a06j-sdxcl2 A06J SDXCL2. Arch Part # 957-000-017 $ 107.07

A06J SDXCL2 Back Boring Steel Coolant Thru .585" Min Bore x 3/8" Shank x 4.5" OAL LH Boring Bar for DCMT21.5_ Inserts with .1875" Offset

+ Quick Shop