The Stems and all Hardware can be instantly removed in installations when only the Anti-Vibration Pads are required. This allows the Installer to fit their own stems or Bolts. In the 2” size a 5/16” dia hole with a weight capacity of up 240 lbs. In the 2 ½" size weight capacity up to 350 lbs a ½ dia size Bolt or Rod can be accommodated. Set of 4 2 1/2" Dia Adjustable Height Leveling Feet with 4" Long 8mm Dia threaded Stern.