LedgerLok is the first fastener engineered to attached deck ledger boards to the rim board of the house with no pre-drilling. No need to predrill and hand-ratchet in 1/2 in. galvanized lags and washers. LedgerLok also has stronger design shear values than 1/2 in. galvanized lag screws. Plus, with LedgerLoks smaller shank diameter even a cordless drill