Tooth Spacing K Value Checking Go & No Go Gauge For Bull Gear 107 Teeth (Mating Shaft Pi Nion- 21Teeth) For Wag-9 / Wag-9 Hc Loco. Size: Go: 317.09/317.17 Mm & No Go (Service Limit): 316.49 Mm. Ref: Rdso Drawing No. Sk.Dp-3848. Material: Tool Steel - Is- 3748/90, Hardness: 40/45 Hrc And Suppl Y With Calibration Certificate. [ Warranty Period: 30 Months After The Date Of Delivery ] ]