The Master Lock No. 8234 Bike Lock Chain with Mini U-Lock is 3ft (90cm) long and features 10mm diameter hardened steel links, offering resistance to cutting and sawing. The nylon sleeve provides protection against scratching. The mini U-Lock features a 3-1/2in hardened steel body for maximum strength and durability, with a 14mm diameter shackle made of hardened steel to resist cutting and sawing. The high-security disc cylinder is designed to prevent picking, while the dual locking levers enhance resistance against prying and hammering. Backed by the Limited Lifetime Warranty, this product offers peace of mind from a brand you can trust.