What separates the BESSEY EHK series trigger clamps from the rest is that it has been engineered from the start to offer a clean design, comfortable handles and potential clamping force up to 600 lbs. The EHK series of clamps has the ability to quickly transform from clamping to spreading. The transition from clamping to spreading requires no tools on all but the smallest version (EHKMICRO). 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.