Our Ruger butt pad is made of non-slip rubber for durability & features horizontal grooves to grip and is concave to hold the stock securely and prevent slipping. It helps to reduce recoil by 40% and Increases length of pull. Compatible only with Ruger 10/22, Mini-14 & Mini-30 Factory Wood stocks (Won't fit on Synthetic stocks). No drilling or tapping required. Easy installation-Use the existing screws from your original rifle stock.