Perfect for fixtures or small boxes, the 24-inch steel bar clamp has a 2-1/2-inch reach and a sliding head design. The sliding head is threaded to accommodate the screw. All adjustments are made in the movable sliding head, making this style easy to open and close and suitable for close-quarters clamping. A multiple-disc clutch permits instant adjustment, secure hold, and easy release. The strong yet lightweight bars are rust-resistant. The bar is 1/4-by-3/4-inch plated steel with a 3/8-inch-diameter steel screw. 600-pound clamping pressure.