With this Socket Head Screw Kit you will have on hand the most popular and most wanted Socket Head screws - ideal when setting a screw down really tight is important - at a really economical price. Lets you fit Socket Head Screws to the widest possible variety of bases, rings, sights and ribs because we've matched the correct head to the required thread size and length for you. Saves you time, hassle and inventory! You get a full selection - 168 Socket Head Screws: 1 dozen each of 14 different screws includes 8 Fillister Head and 6 Weaver Oval Head styles in 4 lengths and 3 thread sizes (6-40, 6-48 and 8-40). Then, when custom fitting is required, or you need to shorten a screw for a particular job, we've included a hardened steel Checker/Shortener Jig to make it easy to grind any of the screws to length.