KNS Precision non-rotating hammer and trigger pins install easily with no modification on all AR-15 and M-16 receivers and prevent wear on the most crucial component of your rifle with special anti-creep retainers. The side plates are Flat Dark Earth Duracoat for maximum durability. These are the strongest pins on the market and were designed to withstand the high impact of full and semi-auto 9mm, .223, 5.56, and 7.62 suppressed weapons. All required tools are included.