Fits: * Sako Large Action A3-A4-L61 * Finnbear * Weatherby Vanguard * Browning L-70 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.