4 x BUSCH BURR JEWELLERY 411 CUP 2.9mm NEW METAL COOKSONGOLD
I bought a box of these from Cooksongold and there are 4 new and unused ones left in the box. CUP BURR 411. Made from steel. Each burr construction is of a number of teeth/blades (in a given shape) mounted onto a shank (usually 3/32).