Liner For Outer Gib Size 75 X 17 X 5 Mm ( Fig.41 ) As Per Rdso Manual G 95.Matl.&Spec. As Per Is:3885( Part 1)/1992 Gr. Iv, Amndt. No.1.Silico Manganese Liners Shall Be Marked For Manufacturer Initial And Month And The Year Of Manufactured By Metal Laser Engraving In 6 Mm Size And 0.1 Mm Depth Minimum.