Heavy Duty Spring Clamps Clip 4.5 Inch for Muslin/Paper Photo Studio Backdrops Background-6 Pack(Black) (6)x 4.5" Photography Muslin Backdrop Clamps,Maximum opening 2.1" Moveable teeth help you to clip the backdrop in any direction,Innovative Movable Teeth for Ultimate Flexibility and Tension. Combine ergonomic with advanced technology and rounded handles for comfortable grip. Soft Durable pads to protect fine finishes,Reinforced nylon construction for strength. Spring clamps to fit onto most backdrop stand, background,photo studio.