Features: This butterfly frame hinge clamp are perfect DIY tool for those who regard screen printing as a hobby. 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. Specifications: Material: Metal Color: Silver Size: About 90x90x60mm Quantity: 2pcs Package includes: 2* Hinge Clamps Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement.