All metal gears. E-Z grip rotating handles. Long lasting powder coat finish. Worm jacking mechanism won't slip. Rust resistant. Heavy duty steel construction. Universal mounting flange. Uses 3/8's Bolt. Installs easily. Ideal for tent campers, travel, horse, cargo and utility trailers. Universal mounting flange.. Uses 3/8's Bolt.. Installs easily.. Ideal for tent campers, travel, horse, cargo and utility trailers. Worm jacking mechanism won't slip. Rust resistant. Heavy duty steel construction. | Ultra-Fab Ultra Topwind Tongue Jacks - 1000 lb