5/8" HITCH PIN LOCK SET RECOMMENDED FOR - Extra long 5/8" diameter locking hitch pin with maximum active length 3-1/2, fits Class III,IV,V hitches with 2", 2.5" and 3" receivers.(Please verify you the size of your hitch and get a suitable hitch pin lock) MORE STURDY AND MORE DURABLE - The hitch lock trailer constructed from heavy duty iron and finished with black e-coated to increase the wear resistance and rust resistance. Watertight dust cap can protect the keyhole from water and dirt. COME WITH SPRING CLIP & 5 RUBBER O RINGS - 1. A separate spring clip and 2 holes provide additional safety, 2 clip holes one for 2" x 2" receivers another for 2.5" x 2.5" receivers. 2. Rubber O rings prevent any rattling and hold the hitch pin still. PUSH LOCK DESIGN MAKE EASY TO USE - With Push-to-lock technology and 1/4-turn lock, make it easy to lock and unlock the hitch lock set. Unlike most of simple lock, our upgraded aluminum alloy Plum Blossom Lock Core round key is much harder to be opened than the flat keys for higher security. SPECIFICATION: Color: Black Main Material: Heavy duty iron & rubber, Finished with black e-coated Use For:5/8 hitch pin fits class III/IV/V receivers(2" x 2" & 2-1/2 x 2-1/2"&3 x 3receiver with 5/8 pin hole ) 5/8" TRAILER HITCH LOCK) INCLUDED: 1 5/8" hitch locking pin 1 Steel Spring clip 5 Rubber O rings 2 x upgraded alloy plum blossom lock core keys