Designed with an extra-heavy O-ring for a watertight fit, this 6" Pry-Out Deck Plate has a nonskid raised dimple-patterned surface for horizontal installation. Pry-out plates should not be installed where internal pressure (oil canning) is present. Made from UV-resistant ASA plastic. Fasteners: #8 pan-head screws or thru-bolts (sold separately). One-year warranty.Plate dia.: 6"Flange dia.: 8 1/2"Cutout dia.: 6 1/2"