Diameter 13mm hole.
Precision Machined Body Lift Kit manufactured from High Density Polyethylene. This is an exceptionally tough, weather resistant, non water absorbing material that can be used down to exceptionally low temperatures. It has high resistance to oils and fuel. The best material available for lift kits.
This will raise the vehicle body height by a nominal 50mm / 2" giving more body ground clearance and allowing fitting of larger wheels should you wish.
These are listed for a customer who asked for a special size for his D3/D4, 2" with a diameter 13mm hole.
Just ask if you want a different size or something special for another vehicle.