4-Roller Wall Mounting Manual Background Support System is ideal for small studio, home studio, Live Content Creation, Webcam Video photo shooting, background paper, photography cloth & PVC cloth. High Quality: 4-Roller wall mounting background support system fits to pipe diameter of 1 7/8" to 3 1/16" 4 Roller enables you to hang 4 different backdrops at the same time and roll up unneeded backdrops Shafts have gear & counterbalanced chains for providing easy raising and lowering the support system Can be mounted both on the wall and the ceiling, the backdrop can be rolled up for saving space Metal brackets, nylon rollers and chains hold backdrops weighing 22 Lbs for strong supporting Product Details: Shaft Dimension (with gear) (LxWxH): 13 1/8" x 3 1/4" x 2 3/8" (33.4 x 8.3 x 6 cm) Shaft Dimension (without gear) (LxWxH): 13 1/8" x 2 3/8" x 1 11/16" (33.4 x 6 x 4.3 cm) Bracket Dimension (LxWxH): 18 1/16" x 1 15/16" x 9 7/16" (45.8 x 4.9 x 24 cm) Chain Length: 72 1/16" (183 cm) Suitable Backdrop Pole Inner Dia.: 1 7/8" to 3 1/16" (4.8 to 7.8 cm) Load Capacity: 22.05 Lbs (10 kg) Material: Metal Brackets, Nylon Rollers and Chains Net Weight: 14.55 Lbs (6.6 kg) Also In The Box: 2x Brackets 8x Shafts 4x Weights 4x Chains 8x Expansion Screws 1x Manual Pipes are not included in the package. Notice: For safety purposes, 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 structure that not solid.