These forged Steel units are used when pulling or tensioning suspension strand. The KleinTools® H Strand Pullers features a fixed and movable jaw linked to a clevis. Applying pull to the clevis causes the jaw in turn to grip the strand. Designed for tensioning strand sizes from 5/16 in. through 5/8 in. (9.5-12.7mm) and for pulling loads that exceed 5000 lbs. but not more than 15,000 lbs. (6818 kg)