The Redi-Lok® Knife Sharpener was designed specifically as a M-LOK® rail accessory that will mount to any M-LOK® rail system. Your sharpener will be right on your rifle, making it easier when you are out in the field! It’s made of light weight military-grade aluminum, including a proprietary corrosion resistant finish. The Duromite™ sharpening elements are harder than any blade. The Redi-Lok® comes in two specific position sharpeners. Our first one is a single standard 40° angle sharpener that maintains a consistent 20° double cutting edge, and our second is a double sharpener that has two positions side by side, an inclusive 30° angle that will maintain a consistent 15° double cutting edge and the standard 40° as well. You can get your Redi-Lok® or Redi-Lok2® in either black or red. We include the hardware & tools needed to install this awesome piece!