Seachoice 70521 Zinc Plated Steel Clamp-On Oarlocks (Sold as Pair)Helping prevent fatigue with an efficient and comfortable rowing stroke for a variety of paddling activities, these clamp-on oar locks are easy to install and fasten securely with a single bolt. Corrosion resistant zinc plating ensures lasting durability. Sold in a pair. Seachoice is committed to delivering quality marine accessories and OEM replacement parts to satisfy fishing, boating and watersports enthusiasts worldwide. Seachoice is run for and by boaters offering a wide-ranging product line while remaining affordable. Oar locks help prevent fatigue with an efficient and comfortable rowing stroke Size: ½ inch x 2 inch Inside Diameter: 1-3/8 inch Easy installation with a single bolt Zinc plated steel construction Manufacturer part number 50-70521