The installs easily onto existing parapet wallswith no need for any additional tools or penetration of the wall surface.Suitable anchor point connection for work positioning or descent off abuilding roof or as the anchor point in your personal fall arrest system.Material: Main Body: Alloy Steel, Set Screws: Zinc Plated Steel, Set Screw Handles: Plastic, Main Body and Set Screw Cushions: Composite Rubber, D-ring: Zinc Plated Steel, Detent Retaining Pin: Stainless Steel w/ Plastic Handle