Tekton locking C-clamps apply direct pressure with fixed points to clamped surfaces, secure small parts, and allow access to tight spaces where a swivel pad won't fit. 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 jaws are made from 6140 chromium vanadium steel, an alloy that offers toughness, machinability, and corrosion resistance. The clamp has a durable, nickel-plated finish that protects against corrosion.