This clamp style features instant opening and closing as with the original PONY steel spring clamps. In addition the heavy-duty tempered-steel spring action allows pressure adjustment from 1 to 50 pounds of clamping force. Light-weight plastic jaws are designed for comfort- able yet durable use. Soft pivoting jaw pads easily hold irregular-shaped objects and protect work pieces. Ideal for gluing models crafts and various other projects. Jaws/Handles - glass filled nylon Spring - heavy-duty tempered steel Jaw Pads - plastic