7" x 10" Warning OSHA Compliant Safety sign made from .060 thick plastic with rounded corners for longer life and easier handling. Signs are pre-drilled for easy mounting with screws or nails (not included). Optional self-adhesive foam tape available. Standard ANSI 1967 header (single word) of "WARNING" printed at top with action message of "Do Not Operate Within 20 Feet Of Power Lines".