Trimax Mini-U-Lock Multipurpose -Made of tough polymer outer coating helps absorb hammer strikes, reduces marring and scratches, rubberized coating to protect painted surfaces. 14MM diameter hardened solid steel shackle with a 5.25 inch extended length inner measurement. Includes 3 ultra secure Trimax Keys. Rotating key cover keeps out dirt and corrosion. 5.25 inch extended shackle (14mm shackle)