This is recommended for indoor storage of bicycles you don't want to park outside, especially for those in apartments and condominiums with limited space. It can be extended in 3 stages, with a maximum length of 3m and a minimum of 1.3m. The rails are grooved to prevent wobbling even when extended, and the aluminum support columns are thick, so I think the durability of the main body is not a problem. I was using it until recently, but I no longer need it because I bought an outdoor storage shed. Based on my own experience, I will honestly state some safety precautions. 1. To prevent tipping, I recommend screwing the base to the floor. * I didn't screw it in myself, but if you don't, please follow the next points and do so at your own risk. 2. The spring tension is strong, so I recommend installing it with two people. 3. I recommend checking regularly for looseness. ◎Installation Method The side with the spring goes on top. While holding down the lower pole, extend it upwards and press the spring side against the ceiling, then tighten the screws at the joints. Tighten the tension by turning the gear-shaped wheel at the base, and you're done. I think you won't be able to extend and tighten it properly unless you have one person holding the bottom and another extending the top. Also, regarding the ceiling to be tightened against, it's ideal to have it along a wall with a beam, but if it's a gypsum board surface, be careful not to make holes in the board, such as by sandwiching a square board to support it with the surface. ◎Product Bicycle stand, for 2 bicycles Accessories are as shown in the photos. Assembly requires a hex wrench. ◎Shipping Simple packaging with bubble wrap. We will ship anonymously via Rakuraku Mercari delivery for peace of mind.