This BlueSpot Tools Heavy-Duty Ratchet Speed Clamp & Spreader has the following specifications: Jaw Opening: 300mm (12in). Min. Clamping Pressure: 70kg. Max. Clamping Pressure: 100kg. The Blue Spot Tools Heavy-Duty Ratchet Speed Clamp & Spreader is manufactured from durable reinforced nylon and has a heat-treated carbon steel bar. With a quick slide function to clamp the workpiece without needing to pull the trigger numerous times to close on your work, simply slide the clamp head down the bar and then tighten fully with the trigger. Non-marring pads protect the workpiece and offer a firm grip. Easy to switch between the clamp and spreading function by reversing the front jaw. Strong and lightweight. With a sturdy pistol grip for quick and easy use. Ideal for woodworking, metalwork and other situations where a high clamping force is required.