NEIKO 10189A Titanium Step Drill Bit, High-Speed Alloy Steel Bit, Hole Expander for Wood and Metal, 12 Step Sizes from 7/16 Inches to 1 1/8 Inches
12 Step Drill bit for drilling holes in wood and most metals. Step size include 7/16",1/2",9/16, 5/8",11/16",3/4" 13/16",7/8",15/16",1",1-1/16", 1-1/8".