Shank Size 1/4''; Overall Length: n/A Model of each holder & orignal insert: MGEHR04-2 (insert MGMN200); SER0250-08 (insert 08ER); SWGCR04-2 (insert: WCMT2.52); SCLCR04-2 & SCLCL04-2 (insert CCMT21.5); SDNCN04-2 & SDJCR04-2 (insert DCMT21.5) T21.5) Black oxided smooth finish on each turning tool holder style and shank size. Each tool holder comes with a C6 TiN coated carbide insert with positive rake cutting angle and built-in chip breaker great for general purpose cutting action. The cutting-off tool can only do cut off jobs. In regard to the other regular cutting, it's better to use the other 6 pieces of the set.