Brackets are constructed from 2" x 1"-11 gauge rectangular tubing that is predrilled to accept mast attachment hardware. Bracket is attached to backstop with a precision cut and formed saddle that is designed to fit backstop mast, U-bolt and flange lock nuts. All hardware zinc plated. Holes to mount shot clock to brackets are field drilled at time of installation to insure proper fit. Hardware to attach Shot Clock to Brackets is not included. Shot Clock brackets are sold in sets of two brackets. One set of brackets required for each shot clock. Shot clocks, conduits, wiring and electrical components are supplied by other parties.