I use it with confidence in the performance function of the product. No problem. Previously it was purchased directly by the manufacturer. Although it is so, it is loose head part of the head during car wash and head is spinning and hard to use, so fix it with screws after assembly and use it. It is additional purchase.
Because the price was cheap, I purchased the shaft and the replacement head several times, but because the joint part is screwed in type, it will easily loosen. Conversely, if torque is applied to the tightening side, the resinous threaded portion will be licked. For use with fixed screws etc., the replacement shaft can be used only about 2 times. Also, it is also stressful that the sponge of the brush part falls off immediately. Still, I think that running costs are the cheapest if used well.