Pro-Shot bore guides are made from aircraft-grade anodized aluminum. The bore guide tips and ends are manufactured using the chemical resistant Delrin. The anodized aluminum sleeve holds the brass pin and will not work loose like other bore guides that use plastic parts. Bore guides should be used when cleaning a Bolt Action Rifle. Bore guides protect the bore throat and keep cleaning solvent from entering the trigger mechanism. Fit Models: Designed for .22 Centerfire - .30 Cal. short or long actions 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 (.22 Centerfire - .25 Caliber/.26-.30 Cal.-Tips and Ends with solvent port ends for both sets