This is a U-shaped lock with an alarm, featuring a stainless steel shackle. Please check the product dimensions on the Xena homepage. It was used for approximately 5 years to protect a large motorcycle from theft (locked to a risk and fork). I intended to use it for ground locking with the chain currently listed, but it doesn't fit into the U-shaped Φ18mm chain ring. Also, I am retiring my beloved motorcycle, so it has become unnecessary and I am listing it for sale. The exterior has some minor scratches as shown in the photos. It's made of SUS (stainless steel), so there is no rust. There is no protective film on the U-shaped part. The included alarm system and a spare are included (with instructions). Button batteries are not included. This is one of the strongest U-shaped locks in Japan, and its security performance is naturally maintained even after 5 years. Please consider purchasing with the understanding that this is a used item. This is a high-priced item, so please feel free to negotiate the price or ask any questions you may have.