FEATURES-Master Gunsmith Torx-Style 6-Lobe Ring & Base Screw Kit-Contains 10 each of 20 premium 6L-10 and 6L-15 style scope ring and base screws-Includes tweezers-Thread size gauge, which also doubles as a shortening jig used to grind a screw to a shorter length-Kit contains-#6-40 Fillister Head T-10 (3/8, 1/2)-#6-40 Oval Head T-10 (1/4, 3/8)-#6-48 Fillister Head T-10 (1/4, 3/8, 9/16)-#6-48 Oval Head T-10 (1/4, 3/8)-#8-40 Fillister Head T-10 (1/4, 3/8, 1/2)-#8-40 Oval Head T-10 (1/4, 1/2)-#8-40 Fillister Head T-15 (1/4, 3/8, 1/2)-#8-40 Oval head T-15 (1/4, 3/8, 1/2)