The Tite-Lok Mounting Track is constructed of aluminum and is specifically for the Black Widow Spider Rigging System (sold separately). This mounting system will fit most gunnels. Wood and fiberglass applications will need different screws; for this reason screws are not included with the mounting track. Model: MT-5901 Width: 3 3/8 in. Inside Width: 3 1/16 in.Qty. per pack: 1 Mounting screws are not includedThe Tite-Lok Mounting Track is made in the U.S.A.