Use the BESSEY® RiteHite to hold your work piece in place with the simple single component design. Having the swivel rocker attached to the clamps means you do not have to worry about misplacing them, like with other 2 piece systems. These fast, self positioning hold-down clamps are made of strong ductile iron. RiteHite hold down clamps can be used on any T-slot machine table (fasteners not included). Using self positioning RiteHite clamps reduces set-up time & increases productivity. The "L" versions are longer offering more reach, while the shorter "S" versions offer greater strength. BESSEY. Simply better.