Brand: RUKO Item: Drill bit Replacement: No Material: High-speed steel (HSS) Application: Hole cutting Finish: Bright Overall Length: 3.1in (79mm) For Use On: Aluminum, brass, plastic, steel, bronze and cast iron Drill Bit Type: Step Drill Bit Size: 3/16in, 1/4in, 5/16in, 3/8in, 7/16in and 1/2in Step Drill Size: #2 Number Of Hole Sizes: 6 Point Cut: Split Shank Type: 1/4in diameter 3-surface Point Angle: 118 degrees RUKO step drill bit, 6 steps, 3/16in, 1/4in, 5/16in, 3/8in, 7/16in and 1/2in, split point, high-speed steel (HSS), bright finish, 1/4in diameter 3-surface shank.