about this item MaterialMade of plastic and aluminum alloy, sturdy and durable. Size4 inches, the clamping force is 30kg, the maximum clamping distance can reach 3cm-10cm, come with a total of 4 to meet professional needs. Quick Clamp Fixing ToolThis F clamp set can quickly and accurately fix workpieces to make woodworking easier and more convenient. Easy to UseTrigger design allows for simple one-handed operation, sliding arm and holds wood in place. Widely used in furniture manufacturing and packaging industry. ApplicableSuitable for spreading or clamping workpieces for welding, gluing or woodworking projects, is the ideal toolbox accessory for DIY and woodworking, metal processing, modeling, etc. Product Description Features: This F clamp set can quickly and precisely clamp workpieces to make woodworking easier and more convenient. Quick release clamps for wood with plastic jaws will not deform or scratch the workpiece, and the handle has a pressure trigger can easily tighten the clamp. Easy-to-reverse jaws turn the pliers into a spreader pliers or stretching tool, make workpieces easier and more efficient Suit for woodworking and a variety of small craft projects. Specifications: Material: aluminum alloy + plastic Main color: black Length: 20cm/4inch Maximum opening size: 9.5cm/3.7inch Clamping force: 30kg Package includes: 4 x pliers quick setting