Helical Inserts Size M 16 X 1.5 Pitch X 1.5'' Long For 3 Phase Loco Axle Box Cover. Material Stai Nless Steel Aisi 304, 18.8 Grade Stainless Steel To As 7245, Mil- 1-8846 & Dtd 734 Specification. [ Warrant Y Period: 30 Months After The Date Of Delivery ] ]