ZERO-LOK mounts go straight onto the action and eliminate play between action and scope, preventing zero shift. These mounts are made of CNC-machine high-grade aluminum with a matte black finish.Features:Fita all Howa 1500, Inter-Arms M1500, Weatherby Vanguard and firearms with same profiles;CNC-machined from high-grade aluminum;Goes straight onto action;Design prevents shifting of zero;Eliminates chance of loose connection