Our "C" Mount Bases allow you to secure rod holders and other accessories without drilling holes. This small clamp is perfect for both round and square rails up to 2" (5.08 cm) in diameter. Rod Holder can be attached on top or at the end of the clamp. Part accepts any Tite Lok rod holder series. Clamp is 1-1/16" (2.7 cm) wide x 1/2" (1.27 cm) deep. Includes Pin-Lok Washer HP-5600