Supply Of Set Of Gauges For Screw Couping Consist Of Following Gauges (1) Thread Profile Ring Gauge (go-01 No. & Nogo-01 No.) Requied Size:m39 X 3mm (exteernal) Wear Limit-01mm Ref. Drg. No. Rdso Sk79063 Alt-4 & Sk99007 Material ? Tool Steel, Is:3748/90 Hardness-50/55 Hrc, (2) Thread Profile Gauge External (go & Nogo) Size-39 X 3mm (ring Gauge) Wear Limit 0.5mm Ref. Drg. No. W/bd-353, Material-tool Steel/stainless Steel & Hardened, (3) Gauge For Trunion 76mm Thickness Required Size-nogo 72 Mm (snap Type) Ref Drg. No. Rdso-sk-79068 Alt-08 & Sk-99002 Material ?tool Steel, Is:3748/90, Hardness-50/55 Hrc, (4) K-thread Profile Gauge (ring Gauge Type) For Screw. Size-55 X 6.35mm- K/thread Go & Nogo Gauge. Wear Limit 01 Mm Ref. Drg. Rdso Sk-79068 Alt-08 & Sk-99002 Material Stainless Steel & Hardnened, (5) K-thread Profile Gauge (plug Gauge Type) For Trunion-lh/rh. Size-55.635 X 6.35mm- D/thread Go & Nogo Gauge Wear Limit 01 Mm Ref. Drg. No. Rdso Sk-79068 Alt 8 & Sk-99002 Material-stainless Steel & Hardened, (6) Feeler Gauge Required Size-03mm, Material Tool Steel, Is:3748/90 Hardness- 50/55 Hrc