These slotted round head zinc-plated machine machine screws with nuts are a 1/4-20 x 3 in. size, supplied as a pack of 3. Stove bolts like these are used to fasten metal parts together that go into a tapped hole, or through a hole and are held by a nut. A nut of the same finish and threading for proper fit is included. Fasten with a screwdriver to reduce the risk of over-tightening and to protect the screw and the fastened material.