Tekton swivel pad locking clamps apply a flat, uniform clamping force that provides more surface contact than fixed points, offering a more secure and gentler hold on a variety of materials, including those with soft or uneven surfaces. Easily set, release, and reposition the clamp with one hand and with more control than a traditional pinch-style lever. The adjustment knob is knurled and round to provide grip for making adjustments even when you're wearing gloves or have slippery hands. Get extra leverage and fine-tune your clamping force by inserting a screwdriver or hex key into the through-hole to create a T-handle. Clamping force at the jaws directly depends on the strength and integrity of the clamp's three main rivets, which together make up the 4-point mechanical structure of the clamp. To make sure ours can withstand high shear forces, these rivets are made from tough 4135 chromium molybdenum steel. The clamps have a durable, nickel-plated finish that protects against corrosion.