GUHOFIND Round Head Pin Vise Round head pin vise with 2 double end reversible collets/chucks made of steel Appr. 10cm in Length, 10mm in Diameter, 30g in weight With the range of the collets can hold reamers as well as screwdriver heads any round shank bits Tool can be used for delicate work such as Jewelry work, repair of watch or clock components Workable diameter 0.5mm-2.5mm