Snap gauges in steel carbide (se & de)i) single ended upto 100 mm as per is : 8023-1976 (or as per our std. Design)ii) single ended above 100 mm as per own design.Iii) double ended as per is: 4583-1968iv) thickness 6 mm to 30mm (optional as per requirement).V) material ohns graded casting with hardened anvils.