The 15/64" Hole, 1" Length 7-8-9 Screw Expanding Plastic Red Screw Anchors are designed for fastening applications in various building materials. These anchors are suitable for use in concrete, tile, or marble surfaces. Constructed from plastic, these anchors are unaffected by moisture, which assists in maintaining a firm grip during installation. The anchors are designed to accommodate screw sizes 7, 8, and 9. Each anchor has a length of 1" and requires a 15/64" drill hole for installation. These anchors are color-coded red for identification. They are suitable for the installation of shower door hinges, clamps, and extrusions. The pull-out strength is 150 PSI on 4000-psi concrete. These anchors are part of a series that includes nine different size options to provide versatility for fastening applications ranging from No.4 to No.16 screws. The minimum order quantity for this product is 100 units. These plastic anchors are designed to provide a consistent fastening solution for hardware installations in residential and commercial settings.