Reese Towpower 7057030 EZ Access II Stainless Steel Class I-IV Sleeved Receiver Lock (5/8" and 1/2") 360 degree swivel head for convenient front access Integrated key slot cover helps protect lock from dirt Maximum security square key design eliminates picking Fits 5/8 inch and 1/2 inch receiver pin holes Stainless steel finish for long product life