Shot Clock Protective Shields

These unbreakable polycarbonate shields absorb the shock from erratic ball contact especially when clocks are mounted to the top of backboards ? May require field drilling to mount ? All hardware included ? Not compatible with Bison Wall Mounted (SHCLKBKTW) or Bison Freestanding Shot Clock Brackets (SHCLKBKTFS) ? Sold in pairs. Additional Information Instructions SHCLKPS