31627, HARDENED POINTS, SCREW ADJUSTMENT, 12" MAXIMUM I.D. MEASUREMENT
These calipers legs are forged of special caliper steel. It has hardened and tempered bow springs and fulcrum spools that assure uniform tension without side play. The adjusting screw has a self-seating washer and nut to permit quick and positive adjustment. Also has hardened measurement faces that meet government specifications. SPECIFICATIONS: Length: 12-5/16" Opening: 12"