The BESSEY EHK Series trigger clamp has been engineered from the start to offer a clean design, ergonomic construction and a range of clamps that offer from 40 lbs up to 600 lbs. of nominal clamping force and clamping capacities from 4-1/2 in. to 50 in. The series has the ability to quickly transform from clamping to spreading. The transition from clamping to spreading to spreading is very simple and does not require tools. All that is required is a quick push of the locking mechanism to disengage the fixed jaw, move it to the opposite end of the rail and re-engage. BESSEY. Simply better.