This screw kit contains 12 each of 23 different screws including Fillister head, Oval head and Plug Screws in several different lengths and threads. All are commonly used for firearms and scopes. Set also includes tweezers for easy selection. Screws are stored in a 24-compartment plastic case. Kit Includes: 6-48 fillister: 1/8, 3/16, 1/4, 5/16, 3/8, 7/16 and 1/2"6-48 oval: 1/8, 3/16, 1/4, 5/16, 3/8, 7/16 and 1/2"8-40 fillister: 3/16, 1/4 and 3/8"8-40 oval: 3/16, 1/4 and 3/8"6-48 plug or set8-40 plug or set10-32 plug or set