The Shackleton is a 12mm steel shackle U-Lock that features an integrated, programmable 4-digit codeRated as a mid-range option on the security scale, the Shackleton shackle opening measures 96mm x 167mm, making it ideal for use with a secondary cable lock, or quick, short-term lock-ups when a rack is handyThe shackle and locking stock are coated to protect your bike, and a spring-loaded push button system make release and engagement fluid and simpleLarge combination wheels designed to be durable, easy to use, and damage resistant to would be thieves12mm3.75x6.75`/9.52x17.14cmKeyBlk5 of 10Included35100UPC/EAN/GTIN: 815189020509