Product review (4 stars): Tough and simple design; a challenge to hammer-in
I bought the 50mm size to replace a more expensive and over-engineered German-manufactured ground spike made of tough polycarbonate, which broke after 3 months in use.

The Brabantia ground spike is a simple but well thought-out design about 50cm in length. It takes a lot of hammering-in and you must ensure you drive it into the ground perpendicular or the clothes dryer pole will not be vertical. The spike will go into soft ground and subsoil but you will need a large mallet or sledgehammer for the job plus bodily strength and determination, and once seated you will not easily get it out.

The spike is 100% aluminium so it won't rust and has tough side fins which help keep it vertical when hammering into the ground, and then makes it more resistant to lateral movement once the dryer pole is inserted and the wind starts to blow the structure around.

The 50mm diameter size has a detachable yellow plastic cap to more easily locate the aperture in long grass, and also protects the channel from rain filling it up during prolonged wet periods.

Overall the product is tough, simple in design and looks permanent, and comparatively cheap. The only caution is that hammering it into the ground is a major operation, and may be virtually impossible if the ground is hard or stony.