Descriptions: Screen printing 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 screen printing hinge clamps are fabricated from iron metal, surface plated color, durable in use. Specifications: Type: butterfly clamp Material: metalSurface treatment: plating colorful zinc Product size: as the picture Weight: 394g Package Included: 2 x Butterfly Hinge Clamp