13 pc. line boring bit 5mm, 57mm long, 10mm shank, 7 RH and 6 LH
There are 7 RH and 6 LH bits. They have the adj. screw in the end and two scoring wings. The overall length is 57mm with a 10mm shank with one flat side for the set screw. Will work in drill press' and hand drills if you chuck around the flat.