General Tools 454-4 Inside Calipers, 4-7/16 Inch Jaw Opening General Tools inside calipers are great for gauging the inner diameter of an opening and then transferring that measurement to a ruler The forged steel legs on this caliper feature hardened points for precise marking of the work piece; An adjusting screw has a self-seating washer and nut to permit quick and positive adjustment Hardened and tempered bow springs and fulcrum spools assure uniform tension without side play while using this inside caliper General Tools calipers have hardened measurement faces and meets government specifications GGG-C-95; This inside caliper has 4-3/16 inch legs and a 4-7/16 inch jaw opening General Tools inside calipers are frequently used in conjunction with General Tools precision rulers for the most accurate measurement transfer