Bessey K Body Revo Parallel Clamps:

1500lbs (nominal) of clamping force!  JThe K Body® REVO™ Parallel Clamp is a powerful tool designed where 90 degree, high pressure clamping or powerful spreading is required.  These are arguably the most powerful and most parallel clamps in the world. The three large removable (if you want to clean or replace them) pressure caps are resistant to glue, paint and solvents.  High quality 2K composite handle with soft plastic insert for comfort while working.  The rail protection pieces (made from impact resistant polyamide) prevent glue dripping on to the rail. With TK-6 table clamps you can easily fasten the rail protection pieces to a work surface.  End-clip ensures clamp sits parallel to work surface and is removable to reverse sliding arm for use as spreader.

Available in seven sizes!

See them in action here!