Hook Clamp - Double Ended Parallel The double-ended parallel hook clamp is available from stock in five sizes. Manufactured from high-quality steel, this clamp is simple to use and extremely strong. Possible to manufacture special sizes to your specification. Check the whole range of Doughty Hook Clamps here. For any inquiries, please contact us via chat. Specifications: Sizes available: 150mm Centres, 225mm Centres, 300mm Centres, 450mm Centres, 600mm Centres SWL: 40kg, same for all sizes Tube Diameter: Ø48 - 51mm, same for all sizes Material: Steel Finish: Available in bright zinc plated finish Other dimensions: Please refer to the image All Hook Clamps are Stamped with SWL. Hook Clamp • Quick Trigger Clamp • Half Coupler Clamps