Carlisle oars have been a top choice for both private boaters and commercial outfitters for decades. Their ABS-coated aluminum design is strong enough to take the abuse of constant use season after season. Inner diameter of 1-3/8" accepts both Carlisle and Cataract blades (sold separately), and the outer diameter of 1-7/8" allows use with either standard oarlock or pin-and-clip oar-mounting systems.