The Cannon Downrigger Stainless Steel Low Profile Swivel Base is cast from 316 stainless steel to resist rusting, pitting and corroding. This 16-point swivel bases locks every 22.5-degrees and provides 360-degrees rotation on any Cannon downrigger. 316 stainless steel construction Six-point locking, including two 45-degree positions Measures: 5 x 5 x 1 1/8 in. Includes four 1/4 in. - 20 x 1 in. truss head screws Cannon part number: 1903002