Gauge For Draft Key Slot Width - 38 Mm, Required Size: Nogo-40.0 Mm (Flat Type) Ref. Drg. No. Rdso Sk 79063 Alt-4 & Sk 99007 Material - Tool Steel, Is 3748/90 Hardness - 50/55 Hrc. Supply With C Alibration Certificate - Valid For Min. 01 Year Issued From Nabl Approved Lab [ Warranty Period: 30 Mont Hs After The Date Of Delivery ] ]