Features: - bimiti Photography 4 Roller Manual Background Support System-Chain Driven Backdrop Elevation System. This is an Ideal set for small studio or home studio, a smart choice for substitute of expensive electrical roller system. - Shafts with Gear and Counterbalanced Chains: The gear and chain would make raising and lowering backgrounds quick and easy. - Heavy Duty Brackets: Our background brackets are able to hold backdrops weighing about 22.1 Lbs. - Photography 4 rollers wall mounting backdrop support system fits an Ideal set for small studio or home studio, compatible with background paper, photography cloth, PVC cloth. Specification: Expansion Bar length: 12.6inch/32cm Chain length: 59.1inch/150cm Load bearing for each one: 22.1lbs/10kg Double Installation Mounted on the ceiling: If you need to mount on the ceiling, It is suggested that the ceiling should be a concrete structure instead of wood ceiling or other is not solid.Mounted on the wall: The roller support holder is firmly mounted on the wall, keeping the backdrops wrinkle-free and flat. Two(2) Four-fold Hooks Eight(8) Expand Bars Four(4) Chains Eight(8) Clamp Screws Photography Backdrop Manual Wall Mount 4 Support Roller System -Easy to install, smooth operation, easily choose your wanted one and roll up the others, save more space in your studio. -Durability & light weight, Adjustable friction control to prevent paper roll out. -The brackets are heavy duty, so they are able to hold heavy backgrounds/backdrops with ease. -The backdrops are easy to fit into the rollers and are easy to switch out when needed. -No need to disassemble frequently, a perfect replacement for high priced electric photo backdrop roller system. Save more studio space. Chain colors are random!! The backdrops and pipes are NOT included. Detachable Chain×4 Detachable chain makes it convenient for you to adjust the length of the chain. Note: chain colors are random. Expansion Bar×8 The expansion bar of the backdrop roll is adjustable and can meet your shooting demands. Thickened Iron Hook×2 Made of the painted thickened iron, the hook is preventing rust and more durable. Counterbalance Weight×4 Help you to control the height of the background cloth. Application Installation Tips - It depends on what type of backdrop you'll use: - (1) For Paper Backdrop Roll with Center Rod - Directly slot the paper backdrop into the expansion rod; - (2)For Muslin or Canvas Backdrop without Center Rod - You'll need to get a center rod (e.g. 2 inches PVC pipe) and attach it to the expansion rod and roll the backdrop onto the pipe. (You can use water PVC pipe available in hardware shops, and cut it to any length to ensure the tube is longer than the width of the backdrop.) How to Install?