Carriage Bolts, Galvanized, 1/4 x 2.5-In., 100-Pk.100 pack, 1 4" x 2. 5", galvanized carriage bolts, designed to fasten a wooden face to either a wood or metal frame, flat head is designed to eliminate the need for a washer & provide a semi flush finish to applications, square underside of the head is self locking to eliminate spinning & the need for a driving tool, the galvanized finish provides optimal rust prevention but can be chalky in appearance.