The 6427 Master Lock ProSeries® Weather Tough® Covered Laminated Padlock features a 2-5/8" heavy steel body to withstand physical attack and a 1-7/8"H, 5/16" Dia hardened boron alloy shackle for superior cut resistance. Padlock is available with or without core with a choice of 16 Small Format Interchangeable Cores to match this padlock to your door looks – accepts standard SFIC OEM cores. The exclusive cover protects from water, ice, dirt and grime.