Safety Step X 2 Hard-to-find heavy-duty step treads, designed for superior non-slip surface area at work or home. Adhesive backing is weather-resistant, adheres to non-porous & semi-porous surfaces. Great for steps, truck running-boards, equipment foot-holds, reduce slips on smooth concrete or tile 1/8"H pad, raised-diamond 1/4"-thick; approx. 80 diamonds per tread (1.2 per sq in). pair of 17" x 4" treads in all-season Matte Black rubber with peel-and-stick self-curing adhesive.