Titan Tools 16501 1/8" to 1/2" #1 Step Drill Bit Titanium coating extends life of the bit Drill 13 different sizes with one bit: 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32 and 1/2 inch