For fastening applications in concrete, block, and brick. Contractor grade anchors. Anchor diameter equals hole diameter. Some common applications are machinery and supports, window frames, partitions, cabinets and shelves, duct straps, and pipe support. Zinc plated steel. Anchors approvals/listings: Factory mutual, Group II, Type 3, Class 3, California State Fire Marshall. Meets or exceeds Government G.S.A. specification: FF S 325. Available in assorted sizes and piece count.