Feature 1This screen printing hinge clamps is used for fixing screen frame when it is printing 2Feature a widewing thumbscrew for firmly fastening the clamp to the frame. 3Use to secure your screen frame to a table or work surface. 4These clamps also feature positive locking for perfect registration. 5Easy to install and positive locking for perfect registration.SpecificationFeatures: This screen printing hinge clamps is used for fixing screen frame when it is printing Feature a wide-wing thumbscrew for firmly fastening the clamp to the frame. Use to secure your screen frame to a table or work surface. These clamps also feature positive locking for perfect registration. Easy to install and positive locking for perfect registration. Specification: Material:;Stainless Steel Weight: 401g Quantity: 2pcs Color: Silver Surface Treatment: Color-plated zinc Size: 85*85*60mm/3.3*3.3*2.4in Package Includes: 1 pair x Butterfly Hinge Clamp Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.