Made of alloy steel-hardened and ground in close tolerances. Annular cutter 1/2" shank tool steel holder (Rota broaches) with lock screw- Accepts/ suit 19 mm shank rota broaches This holder can be used in a drill press, lathes, mills or magnetic drilling machines. Holder dimensions: Shank 12.5 mm (*through bore 7 mm) , OAL: 62 mm, Holder body diameter: 36 mm, ID to hold cutter's shank 19.05 mm, Depth for holding cutter's hank : 25 mm, 2 x grub screw @ 90 degree for clamping of cutter's shank