Durable split-point tip for fast, accurate material penetration.​ Patented split-step design optimizes chip load for fast, smooth cutting, and more holes per charge.​ Progressive cutting edges provides power tool accessory balanced aggression to maximize torque efficiency and minimize stalling.​ Improved double flute design for superior chip evacuation, cutting speeds and tool life.​ Three-flat shank for all 1/2" drill chucks.​ Laser markings for quick, easy product and size identification. Replaced 35884 Specifications Type Multi-hole Step Bit Set Application Cuts mild steel, aluminum, brass, copper, wood, fiberglass, plastics and laminates Minimum Drill Diameter GSB01: 1/8" (3.2 mm), GSB04: 3/16" (4.8 mm), GSB09: 3/16" (4.8 mm) Maximum Drill Diameter GSB01: 1/2" (12.7 mm), GSB04: 7/8" (22.2 mm), GSB09: 1-1/8" (28.6 mm) Maximum Sheet Metal Thickness 10 gauge (3.5 mm) Included GSB01 (1/2" bit) , GSB04 (7/8" bit), GSB09 (1-1/8" bit) and carrying case