![Drill Bit - 1/4"- 3 Flute - 3/4" LOC - 4" OAL - ZrN Coated 80% AR15-AR10 Lower Receiver Jig End Mill](http://www.americangunsmithtooling.com/cdn/shop/products/Drill_6_3d4162ed-8e1b-49ec-ac5c-d98d16567df2_1024x1024.png?v=1494547151)
6 Pack 5/16" Premium High Performance "TiN" Coated High Speed Steel Drill Bits
What is "TiN" Coating? Learn More!
6 Pack 5/16" "TiN" Coated High Speed Steel Drill Bit,135 Deg Split Point, HSS, The Best High Performance drill bit for AR15 / AR10 / .308 Lower Receiver Jigs. Drill bits were designed specifically for drilling aluminum.