Proven rugged with years of customer experience, these Invincible Marine BR56104 Heavy-Duty Clamp-On Oarlock Horns secure your oars with steadfast strength! These oarlock horns fasten to oars with one adjustable bolt and no drilling. This product has a 1-5/16-inch to 2-1/8-inch diameter for oar shafts, and a ½-inch shank, and comes in 2-packs. Whether you"re outfitting your boat for the first time, or replacing well-worn nautical parts, this product is an essential accessory for your boating and domestic needs, and is perfect for nautical journeys and mechanical maintenance. Precision and reliability are the marks of quality that this product has proven time and time again, guaranteeing steadfast performance with each use. The Invincible Marine BR56104 Heavy-Duty Clamp-On Oarlock Horns come with a 1-year limited warranty and protects against manufacturing and workmanship defects. Rugged, tough and reliable, Invincible Marine is well-known for their hardworking nautical line. For freshwater and saltwater boating, Invincible Marine designs products for avid fishermen and weekend boaters. Quality, utility and innovation go into every Invincible Marine product giving you more time on the water.