Pro Heavy Bag Hanger - Wood Beam & Concrete Ceiling - Boxing Bag Hanging Kit with Wood Mounting Screws, Steel Concrete Mounting Screws - Accessories for Punching Bags, Boxing and Mma, Fitness SWIVEL SYSTEM WITH STEEL BALL BEARING - High grade metal ball bearing,rotate more efficiently. 360 degree swivel, works great if you use it. EXCELLENT RELIABLE AND DURABLE BAG MOUNT - It handles the weight suspended from it without any sign of strain and the swivel turns easily. TWO DIFFERENT SCREWS - Two STEEL concrete mounting screws. Two wood mounting screws. Can be used on Wood Beam or concrete ceiling. UNIBODY DESIGN HOOK WITH O-RING - Work great for spinning and hanging. It's very strong. Includes all the nuts and bolts you'll need for installation. SUPER STRONG HEAVY DUTY CONSTRUCTION - Premium quality metal material, super strong and ultra durable. Fully support heavy bags up to 220 lbs.