$52.99 m12 X 1.75 High Speed Steel Plug Tap and 10.25mm High Speed Steel Drill Bit - Walmart.com 
Hammer Drill, TACKLIFE 1/2-Inch Electric Drill, 12 Drill Bit Set, 2800 RPM, Var | eBay
Spyder 600843 12 Inch Steel Hex Bit Extension & 600634H 1/2 Inch Shank Drill Bit - Walmart.com 
