Skid Clamp Anchors for Masonry Walls Model HDW-ANC-MAS-6These high-tech plastic anchors hold securely in plaster, brick, and concrete walls. Easy to install, they really grip the edges of the hole for a secure mounting. The small diameter head sits flush with the wall surface and is completely concealed by the Skid Clamp base, making for a super clean installation. Recommended for use with STC5565 Skid Clamp Bases Includes: 4 Ribbed Nylon Masonry Wall Anchors 4 6 x 1-1/4 Truss Head Sheet Metal Screws Â