Master Lock® Safety Padlock, Rekeyable, series: ProSeries®, Alike Key, Shrouded Laminated Steel Body, 5/16 in Shackle Diameter, 3/4 in Shackle Height, 7/8 in Shackle Width, Boron Hardened Alloy Steel Shackle, 2-1/8 in Body Width, 5-Pin Tumbler Locking Mechanism, Black. Master Lock® 6321KA ProSeries® Rekeyable Safety Padlock, Alike Key, 5/16 in Shackle, Shrouded Laminated Steel Body, Black