K- Thread Profile Gauge (Ring Gauge Type) For Screw. Size - 55 X 6.35 Mm - K/Thread. Go & N Ogo Gauge. Wear Limit - 1 Mm Ref. Drg. No. Rdso - Sk - 79068 Alt-08 & Sk - 99002 Material - Stainless Ste El & Hardened. [ Warranty Period: 30 Months After The Date Of Delivery ] ]