![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_0ed6abc7-ae71-4a02-86bd-9e538756d859_1024x1024.png?v=1494547156)
7/16" Premium "TiN" Coated High Speed Steel Drill Bit
What is "TiN" Coating? Learn More!
7/16" "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.