Stainless Steel Barbell Push-to-Lock Receiver Lock. Stainless steel Barbell lock fits 5/8 in receiver openings. Push to Lockandtrade locking mechanism- push lock body onto pin firmly and remove key. Class III/IV, 10,000lb. Load rating. Weather Tough seal and water tight cap protects lock from moisture and dirt. 4-pin tumbler mechanism resists picking . K1 key blank. Retail packaging, shelf pack quantity 4, master carton quantity 24.