$67.99 drillpro 8pcs 1/2 inch shank hss 4241 twist drill bit set 9/16 to 1 inch twist drill for wood 
1Pc High Speed Steel 1/2 Drill Straight Shank Twist Metal Drill Bit | eBay
1/2 Straight Shank 18mm Cutting Diameter High Speed Steel Twist Drill Bit - Walmart.com 
