Enhanced Stock Wrench For stocks. Precision machined from heat treated steel, our multi function tool is a necessity for any AR15 enthusiast. This tool includes a Mil-Spec castle nut wrench, a standard length receiver extension removal wrench (does not work for MR or HK 416 series of rifles however), and an A1/A2 Flash Suppressor wrench. Offering an improved grip, each tool has a rubberized grip for both safety and comfort. Every tool is coated in manganese phosphate for reduced visibility and corrosion resistance. Made in the USA and features a lifetime warranty.Manufactured from heat treated steel 100% U.S. Made Rubberized Grip Manganese Phosphate Finish Works as:- Mil-Spec Castle Nut Wrench- Standard Length Receiver Extension Removal Wrench(does not work for MR or HK 416 series of rifles however).- A1/A2 Flash Suppressor Wrench