The Carver Medium-Duty Rack Clamps have a variety of uses. The most common include welding, metal fabrication, moulding box and die holding, plate fabrication, plastic and fibreglass moulding and maintenance work.The Carver T290-450 Medium-Duty Rack Clamp has the following specification: Capacity: 450mm (18in).Reach: 90mm (3.1/2in). Overall Length: 655mm (25.3/4in).Clamping Force: 1,800N.Weight: 7.0kg.