Convert your HD3, HD4, or Shark II HDPE clamp and cradle to the new heavy-duty extruded aluminum router clamp developed for the HD5. Includes backplate adapter, extruded aluminum router clamp with tapped 1/4 - 20 bolt holes for standard dust boot, and built-in accessory plate. Fits most routers with 3.5" diameter motors like Bosch 1617, Dewalt DW618, Porter Cable 890, etc.