4 jaw 70 mm chuck with a back plate & t nuts Back plate is drilled in a manner that it can be mounted on both 3 as well as 4 slot Rotary table. Drill Size is 6 mm T nuts set # 3 Set ENABLE THE USER TO DRILL OR CUT ANY WORK AT AN EXACT INTERVAL AROUND A FIXED AXIS (GENERALLY VERTICAL OR HORIZONTAL). A high 4 Jaw Independent chuck, the body of which is made from SG Iron & Jaws are of Tool steel hardened & ground. Same Jaws are reversible as well. Supplied with a mounting back plate & fixing tee nuts with screws. The Back plate has been drilled in a manner that it will fit to a 3 slot or a 4 slot rotary table. The chuck mounting is standard Unimat Thread M14 x 1.