12mm round shackle x 230mm. Innovative soft touch housing cover prevents damage to paint. Shackle, body and supporting elements made from temper hardened steel for cut and torsion resistance. Pass-through shackle provides anti-twist protection in a simple innovative design. SH 34 Bracket mounts easily to frames with 24-35mm diameter. Newly patented pick and break resistant 6 wafer key and key Cylinder. 2 Keys Provided, double layered, special wafers with decoy cuttings for added security.