Pinheads City Lock weighs in at less than half other same-size frame locks. Opens and locks only with your unique coded key, two included. Ergonomic shape with robust 40 x 14 mm cross-section denies bolt-cutters. Colorful coating prevents frame scratching. Single-latch, hinged-closure and patented hidden-key entry resist even sophisticated attack. Inside shackle dimensions 72 x 151 mm, outside dimensions 105 x 187 mm. Includes patented mounting bracket (not shown) for secure and convenient stowage on seatpost when riding. The City LockTM uses the same key as other Pinhead locks so you can now lockup your frame, wheels, seat post, saddle and headset with a single security system,.