This Graco drill fixture works for the GraCoil S and LP models, the only difference is the hole depth. Once the stock has been cut off and the mounting screw holes have been drilled, then the drill plate can be mounted. Now you are ready to drill the 1 1/8" diameter hole to required depth and then drill the 3/8" hole in two places to their required depth. Remove the fixture, fit the plate and you are done. Unit comes complete with steel plate, 1 1/8" multi-spur bit, 3/8" drill bit and drill bushing. FeaturesEnhanced Precision: Achieve exact drilling for accessory installations, leading to improved firearm performance and aesthetics.Time Efficiency: Streamline the customization process with tools designed to simplify complex drilling tasks.Professional Results: Obtain a high-quality finish in your gunsmithing projects, reflecting the standards expected by professionals.