3 Piece HSS Black & Gold Quick Change Hex Shank Step Drill Bit Set (Sizes #1 to #3) Quantity:1 Internal Diameter: 5/16"-18

Internal Diameter: 5/16"-18

Part Number: BIT-VAC1HEX

Style Miniature

Use on Automotive

Part Number: 87C300HSBA325G/PT

3 Piece HSS Black & Gold Quick Change Hex Shank Step Drill Bit Set (Sizes #1 to #3) Quantity:1 Internal Diameter: 5/16"-18Product Description Step drills have single radial concave flutes to create a perfectly round hole in metal, plastic wood and other thin materials without center punching. Constructed of industrial grade high speed molybdenum steel, heat treated and temperature for long life. Self starting tip. No center punching needed. Automatically deburrs top side of hole. Ideal for steel, copper, aluminum and other thin materials. They are Black and gold surface