➤ Made of polished finish 316-grade stainless steel.➤ Dimensions: Tube Length :2 "Shaft diameter :1/2 in. /12 mm.Please allow an error of 1-2mm.➤ The Clamp-On Oarlock fastens securely to the oar with one adjustable bolt with no drilling required.➤ Strong corrosion resistance and durable in saltwater circumstances. Ideal for kayak, canoe, marine boat, dinghy, lifeboat, water raft boat, yacht, and so on.➤ If you have any questions about our products, please feel free to contact us.