Steel: 31CrV3 38-42 HRC Nickel plating. Size: 19 mm A: 125 mm d: 16 mm Length: 275 mm The gas key is used for installing/dismantling threaded connections when replacing car wheels. The blade located on the reverse side of the key is used for wheel distribution and also as a mounting tool. The A offset and the thin but strong end part are designed to be used with any type of wheel rims. The key undergoes full heat treatment along its entire length.