This Irwin 14 pc. Set of ABS Plastic Spring Clamps features four different sizes to provide a variety of working options. Non-slip handles. Designed for comfortable hand span. Incorporated into the handles are grooves to prevent slipping for the quickest clamping possible. High-Tech Resin Material. Made of durable glass-reinforced nylon affording lightweight durability The jaws are configured to hold odd-shaped work pieces. Jaws open to complete parallel position. Non-marring spring clamps incorporate soft, pliable, removable pads with each clamp to protect work pieces.