Descriptions:Screenprinting hinge clamps, also called butterfly clamps, are fabricated from iron metal, surface plated color. They are used for fixing screens when printing. They feature a wide-wing thumbscrew for firmly fastening the clamp to the frame. These clamps also feature positive locking for perfect registration.Features:Feature a wide-wing thumbscrew for firmly fastening the clamp to the frame.These clamps also feature positive locking for perfect registration.A loose pin permits quick screen removal.These butterfly clamps are used for fixing screens when printing.Easy to screw it on any flat surface.These screenprinting hinge clamps are fabricated from iron metal, surface plated color, durable in use.Specifications:Type: butterfly clampMaterial: metalSurface treatment: plating colorful zincProduct size: as the pictureWeight: 394gPackage Included:2 x Butterfly Hinge Clamp