supply of double end spanner for fish bolts low weight 1.3kg (alloy of low carbon steel chromium.double end spanner for fish bolts low weight 1.3kg (alloy of low carbon steel chromium.,double end spanner for fish bolts low weight 1.3kg (alloy of low carbon steel chromium an d vanadium). specification : special spanner for fish plate bolts confirming to jus: 4835 or equivalent, dou ble open ended with 15 degree angle, size 36mm x 41 mm at either end, length 680 mm(min) & 760 mm( max), manufactured by forging process with black phosphate finishing, heat treatment with controlled oil bath process hardness of final product- 380-400 bhn, approx weight 1300gm plus or minus 5%, capacity with 500nm torque without breakage. [ warranty period: 12 months after the date of delivery ] ]