4-pin tumbler security. Dual steel levers lock both sides of case-hardened, 9/32" diameter steel shackle. Clearances: 3/4" vertical, 5/8" horizontal. 2 brass keys. Only SKUs with KA in the model number are keyed alike padlocks and all item ordered from that SKU number would be keyed alike to the 4-digit key number shown in the product description.