![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_1_84f9f85a-34a3-4350-88ae-d94c0a117e1f_1024x1024.png?v=1494547142)
31/64" Premium "TiN" Coated Coated High Speed Drill Bit
What is "TiN" Coating? Learn More!
31/64" "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.