GrovTec USA Non-Rotating Flanged Base Features The GrovTec USA Non-Rotating Flanged Base is built from stainless steel with a black-oxide finish giving it the corrosion resistance and durability needed for sling hardware that takes repeated stress from carrying and slinging a firearm. Three set screws bite into the stock material to lock the base in place eliminating the rotation that loose sling hardware can develop over time. Once installed the flanged base provides a stable anchor point so a push button swivel locks in securely rather than working its way loose during movement. The included retainer nut gives the installation extra holding strength specifically for hollow stocks where a standard screw alone would not provide enough purchase. GrovTec USA designs this hardware for hunters service members and shooting sports competitors who want gear built by people who understand how it gets used in the field. Converting a stock to accept push button swivels opens up compatibility with the wide range of quick-detach slings on the market today. The non-rotating design means the sling stays oriented the way the shooter set it up which matters when a fast sling transition is part of the plan. For a shooter upgrading an older or hollow-stocked rifle to modern sling hardware this flanged base is a simple dependable fix. GrovTec USA Non-Rotating Flanged Base Specifications Manufacturer: GrovTec USA Model: Non-Rotating Flanged Base Type: Sling Adaptor Color: Black Material: Black-Oxide Steel Compatible Hosts: Hollow Stocks Push Button Swivels Available At: GrabAGun