1/4" x 2-1/2" Round-Head Zinc-Plated Combination-Head Machine Screws - 100-pack

These screws are installed into an existing or predrilled, pre-tapped hole and are fully threaded. Measurements are made from the underside of the head to the tip of the screw to obtain fastener length. If nuts are needed, use with nuts of the same material, finish, and threading for proper fit (not included).
These machine screws are used with nuts (not included) or directly into a female threaded receptacle to fasten metal parts together .