Our Mainspring Tool for Remington bolts is an easy to use spring compressor which allows you to disassemble the firing pin and mainspring from the bolt body. Our tool has an anodized aluminum body, steel lead screw and a large comfortable handle. This tool in conjunction with the Sinclair Firing Pin Removal Tool, is a must to change firing pins or springs safely, without damaging the bolt or bolt parts. Also works on Stolle Panda actions and others with Remington style bolts. Mfg: Sinclair International