These screw mounted Inspection Covers are constructed of UV stabilized ABS. They offer an economical alternative to a screw out deck plate and are ideal for use in situations where access will be infrequent. These covers are a more secure option, requiring a screwdriver for removal. Use silicone sealant when installing for easier removal later. Installs with four #10 FH fasteners (not included). Avoid contact with acetone or strong solvents.