The Tower Erector Helper can erect towers up to a height of 18 m (59.00 ft)
The Tower Erector Helper is a specially designed triangular steel frame with a steel outrigger base connection. Equipped with a chain hoist, the helper is able to erect the MILOS S-MT-Q-PA Steel Tower without the need of crane.The helper can erect towers up to a height of 18 m (59.00 ft) (with the use of a 2-m-long (6.56-ft-long) truss cantilever).
More detailed information here.