Del city 9801 adhesive mtg base- 2-way- 1″ sq- black, 100 pieces bases can be attached to a clean and dry surface of metal- plastic- glass- paper and painted surfaces. a screw or rivet is recommended for extra holding strength against outdoor elements. bases are made with durable 6/6 nylon with acrylic adhesive. Adhesive has a higher melting point. the counter-sunk hole for the screw or rivet will not interfere with the cable ties. meets ul84v-2 flammability classification. the bases can be used on all self-locking ties up to 14″ and 75 lb. Tensile strength.