Massive, 13mm hardened ultra steel shackle provides maximum cut resistance. Dual Steel Bar locking mechanism delivers up to 10 tons of pull strength while the M-Cylinder technology puts drillers and lock pickers out of business. Rough and tumble Ballistic plastic withstands mistreatment while protecting your bike"s finish. Includes All Tube, multi-position, QR mounting bracket, 4 laser cut keys with 1 light key for use at night and cable. Vinyl covered and weatherproof. Dimensions: 3.5" x 5.5".