Premium Norseman Viking Drill Bit - 59/64 Size Vortex Heavy Duty Drill Bits Norseman By Viking Drill And Tool 26443 4 Piece 9/16 In. To 1 In To 1 In Heavy Duty Black And Vortex Drill Bits Unique tip geometry reduces heat generation & cutting tool wear increasing tool life., 9/16, 5/8, 3/4, 1 in., sizes. 120.61 KnKut 21 Piece HD Hex Shank M35 Cobalt Jobber Length Drill Bit Set 1/16-3/8 by 64ths Introducing the Norseman by Viking Drill and Tool 26443 Vortex 1/2 in. Shank Set, a heavy-duty black and gold drill bit set designed for superior performance. This 4-piece set includes sizes from 9/16 in. to 1 in., making it ideal for a wide range of hole enlargement tasks Recommended for cast iron, brass, sheet metal, plastic, mild steel, copper, hardened steel , 3-flats on shank , Made in the U., S., A