Fits: * Remington 700-40X-78-72-722-725-788 – XP-100 – Model 7 – 600-660 * Ruger All Model 77 * Winchester 70-54-56 * Savage 110-112V * Mauser 98 * Enfield 1917 * Hart * Stolle * Kimber 89 * Browning A Bolt * Dakota Proshot Bore Guides are made from aircraft grade anodised aluminium. The anodised aluminium sleeve holds the brass pin and does not work loose like plastic parts. The sleeve pin is made of brass and the stopper bore guides are manufactured using delrin, a durable chemical resistant material.