These anchors combine freedom of movement and dependable fall protection. When attached to a beam, the anchor trails behind the user through attachment of a shock absorbing lanyard. Anchors are simple to install, remove, and size, with no pins or chains. Dual beam grip adjustment prevents twisting and turning as it moves along the beam, and synthetic wear pads are replaceable. * May be used over head or at foot level when used with the BlackMAX™ shock absorber. Fits flanges 5-1/2" to 26" Wide and 1/2" to 3" thick. (14 - 66cm wide, 13 - 76mm thick)