This is a SOLID Stainless Steel Lug Nut. This Stainless Steel Trailer Lug nut is made of 304 Stainless Steel, with a standard 1/2-20 Thread Size and a standard 60 Degree  Cone. This is referred to as an acorn Style Lug Nut, with an overall height of 1 5/8 inches. In addition, the lug nut itself WILL NOT RUST! You will use a 13/16 inch socket to remove/install this trailer lug nut. This will fit most 4 lug, 5 lug, 6 lug, and 8 lug trailer idler hubs and brake drum hubs. Ideal for ANY trailer environment! Pays for itself the very first time you go to replace a tire!!!! No more rusted or difficult trailer lug nuts when the time comes!! Simply apply some spray grease to the hub studs before installing and you're good to go! The ideal product for lubricating the trailers studs would be White Lithium Grease Spray  Lubricant and Protector.