Aqirui Heavy Duty Spring Clamp Dimension: 4.1 inch x 3.15 inch x 2.56 inchWeight: 1.85 poundsMaximum Opening: 2 inchMaterial: Super heavy duty metalClamping Force: 5KGQuantity in Box: 8 pieces Backdrop clips Super heavy duty metal The spring clamp is made of Super heavy duty metal. Durable rubber pads The backdrop clips with durable rubber pads covered on end grips that greatly helps for keeping things extra secure and damage-free for the finish. Strong Clamping Power Their strong clamping power make these clamps very easy to use and tough enough to work. Backdrop Clamps for Backdrop Stand, Photo Studio Muslin Spring Clamps in life