$54.99 2pcs 1/4--1-3/8 & 1/8--1/2 Step Drill Inch Titanium Bit HSS Cone Step Drill Bit | eBay
5pcs Step Drill Bit Set Hss Cobalt Multiple Hole SAE Step Drills Two flute Design 50 Sizes #1 #2 
5/16 Pilot to 1/2 Subland 4.75L Step Drill Bit HSS Double Margin 90° | eBay
