Made of SK2 material of JIS specification.

Hardened by heat treatment and precision ground.

Hardness HRC 54°+/-2°.

A: 72mm, B: 34mm, Cmax: 99mm, D: 32mm, E:190mm, l:9mm, f: 12mm, g: 56mm, h: 7mm, j: 8mm, k: 8mm, H: 66mm, M: 35mm, O: 8mm.