CE Smiths Aluminum Clamp-On Rod Holder fits the round rails on your boat. Made of polished, marine-grade anodized aluminum for long-lasting performance and a secure, slip-resistant fit. Features a heavy-duty 0.38-thick blade, welded 0.33H gimbal bar and 1.63 rod-holder inside diameter. Flared opening provides easy insertion of your rods handle. Super-strong 316 stainless steel screws. Available: Horizontal, Vertical. Clamp outside dia. (rail dia.): 1.05 (0.75), 1.315 (1), 1.66 (1.25), 1.9 (1.5), 2.375 (2). Type: Rod Holders.