Quality rust free marine grade stainless steel, specifically formulated for use in the marine environment. This super convenient multipurpose Scuba Tool is custom designed to suit most diving applications. 6 Spanners 9/16", 13/16", 11/16", 1/2", 5/8" & 15mm, crosshead & 2 flat screwdrivers, 4 & 5mm Allen Keys & a pointed tool. Folds away tidily when not in use.