Sure Grip Power Plugs are a 5/8" aluminum stem with real USA rubber and made in the USA at the Sure Grip factory. They are sold in pairs and provide superior grip and durability. They will fit most 5/8" toe stop theaded plates including the Sure Grip Cyclone, Century, Classic, Avenger, Avanti, XK4, Power Trac, Laser, and Snyder plates. Please check your brand of plates to see if they are compatible.