Sold as 5 UNITS at $4.70 per unit. (1 unit = each.) 1/4" shank. Countersink, deburrs and chamfer holes in soft metal and wood. Fits all drills. Carded. 1/2" Dia. Manufacturer number: 16643. SKU #: 27805. Country of origin: (TBA). Distributed by Bosch Tool Group-Vermont Amer.