The Malta Dynamics A6301 - Roof Anchor 18" Standard is a fixed post roof top anchor, intended for permanent applications only. The A6301 has been thoroughly tested (see testing and compliance page on this product) and is compatible with installation on steel and concrete substrates (fasteners sold separately). Meets the requirements for anchors rated for window cleaning. The 18-inch anchor post functions to extend though roofing materials so that it is accessible both during and after roof construction. The A6301 roof anchor is composed of durable galvanized steel and is compatible for use with SRLs, vertical lifelines, and shock-absorbing lanyards.