Gauge For Bottom Side Of Shank - 56 Mm Height Draw Hook, Required Size: Nogo - 41.0 Mm (Snap Type) Ref. Drg. No. Rdso Sk 79062 Alt-05 & 99007 Material - Tool Steel, Is 3748/90 Hardness - 50/55 Hrc. Supply With Calibration Certificate - Valid For Min. 01 Year Issued From Nabl Approved Lab [ W Arranty Period: 12 Months After The Date Of Delivery ] ]