Pin Vise & Wire Rounder Set Use this handy 2 in 1 tool as a Wire Rounder to smooth off sharp or jagged edges on wire after cutting. But it also doubles as a Pin Vise, featuring two adjustable chucks which can accommodate up to 3mm wire for twisting! This set includes the wood top pin vise and two cup burs, inside diameters 1.20mm and 1.80mm. The chuck style ends make for easy replacement of worn out burs. Overall length: 4" Bur size:1.20mm & 1.80mm Why do I need this item? This handy tool is great for twisting wire for designs, or when making jump rings. And the two adjustable chucks work great for holding Cup Burs used to smooth and round off sharp ends after cutting wire.