Hillman Group Galvanized Carriage Bolt 3/8? x 2?, 100 Count, Blunt Point, Alloy Product Description Hillman has the specific screws and bolts you need for your building projects. Carriage bolts are designed to fasten a wooden surface to either a wood or metal frame. The smooth, domed head screw offers a semi-flush, low-profile finish to applications. To install, simply drill a hole in the surface that matches the diameter of the fastener, insert the bolt, and connect the nut on the other end. No washer is needed because its square shoulder locks into the material as the nut is tightened. These round head fasteners will last for years thanks to their galvanized finish, which offers optimal protection against rust and corrosion. From the Manufacturer Carriage Bolts have a smooth, rounded head that has a small square section underneath. They are used in wood connections utilizing the square neck under the round head which will sit into the hole to prevent the head from turning. These carriage bolts come plated in zinc for moderate corrosion resistance. Features MULTI-MATERIAL FUNCTION: Designed to fasten a wooden surface to either a wood or metal frame LOW PROFILE HEAD: Smooth, domed head provides a semi-flush finish NO WASHER NEEDED: Square shoulder locks into material, eliminating the need for a flat washer RUST-RESISTANT FINISH: Galvanized finish offers optimal protection against rust and corrosion 100 COUNT: Each package contains enough carriage bolts for completing various assembly projects USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.