This Swampfox Ultimate Red Dot Mounting Screw Pack contains 15 four-screw sets of various thread pitches and lengths. These small-head, T10 screws are the most likely to be the “problem solvers” needed to attach Kingslayer, Liberty, Justice, and Sentinel to those slides and mounts. Five sets of Do-It-Yourself screws (6-32, 4-40, 6-40, M3, M3.5, M4 pitches) deliberately feature a too-long-for-everything 14mm effective thread length. Small heads: all heads 5.0 mm diameter except #6-32 specs (5.5 mm diameter).