The Master Lock No. 6230 ProSeries® Solid Body Padlock features a 2-1/2in (64mm) round wide solid steel body and a 1-1/8in (29mm) tall, 7/16in (11mm) diameter hardened boron alloy shackle for superior cut resistance. Chrome rustproofing provides longer life and a dual ball bearing locking mechanism resists pulling and prying. Ideal for industrial and construction applications, the high security, rekeyable 5-pin cylinder with spool pins is virtually impossible to pick.