4-Way Adhesive Mount Base - Black - 100 pieces - 3M Product - Strong adhesive backing for easy installation. Drilling is not required, but is optional for more secure mounting. Can be used on all self-locking ties up to 14-in and 75 lb. tensile strength. Size is 3/4" square. 4-way entry for maximum versatility. Clean contact area thoroughly before applying the mounting base for maximum performance.