The Lindapter 'FF' Floorfast Clamp consists of a malleable iron body casting with a countersunk socket screw. The eccentric stepped web design of the casting allows the Floorfast Clamp to lock under the steel, providing full face contact when torque is applied. For thicker flanges, packing pieces can be used. Lindapter 'FF' Floorfast Clamps are available in zinc plated or stainless steel and come in various sizes.