The Shackleton is a 12mm steel shackle U-Lock that features an integrated, programmable 4-digit code Rated 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 handy The shackle and locking stock are coated to protect your bike, and a spring-loaded push button system make release and engagement fluid and simple Large combination wheels designed to be durable, easy to use, and damage resistant to would be thieves 12mm 3.75x6.75`/9.52x17.14cm Mini Black 5 of 10 Included 35100UPC/EAN/GTIN: 815189020509