"When loading up equipment or vehicles, the last thing you want is to hear or feel the tires spinning. Load up securely in any weather condition with this four pack of HD Ramps 30"" x 6"" Trailer Traction Treads. Each aluminum tread features circular punch plate traction to grip tires and keep them moving. With six pre-punched holes, each HD Ramps Trailer Traction Tread is designed to be installed any surface where extra traction is required, such as enclosed trailers with fold-down ramp doors, open trailers, or wooden shed ramps. They install with your choice of hardware (not included), and will make it a lot easier to load up in muddy, icy or wet conditions."