Full Stainless Steel Product, very good performance in its use, though a little bit heavy...Many available end cap threads, 1/2-28, 5/8-24, 1/2-20, 3/4-16, 13/16-16, M15*1, M16*1.25, M18*1, M24*1.5 Stainless steel has higher hardness and wear resistance than aluminum, stainless steel will not be corroded. Stainless steel is more resistant to high temperature and low temperature, and can guarantee its stability during continuous high temperature and low temperature work. Stainless steel will not oxidize for a long time, and there is no trace for a long time. Suitable for long-term work in the automotive fuel environment. Cups and end cap with center marked.syi