To ensure selection of the appropriate clamp size for your application, please note that 'Size' refers to trade size conduits, or pipe interior diameter (ID), not clamp measurements. See photos for exact clamp and pipe diameters and other dimensions. Corrosion resistant, made from durable and high quality steel. Secures piping to studs or joists to reduce vibration noise. Used to mount rigid or IMC conduits where higher load bearing supports are needed. Feature a reinforced hole and reinforced rib for extra strength. Snap-On Installation. Two screw holes allow the installer to secure pipes on walls and ceilings. Sturdy securing prevents accidental pullout in high traffic areas. Screws are not included.