Description: Heavy duty marine grade cast solid stainless steel, corrosion resistance, tough, strong and durable Screw type drain plug for positive sealing Retention system prevents plug from getting lost when removed Mounts in a 1" diameter hole High polished head side for mirror-like appearance and to match modern watercraft/boat/yacht Great for boat transoms, fish wells, ice chests and more Specification: Crew Type Stainless Steel Drain Plug for Boats - Fits 1 Inch Hole. Made of stasinless steel 316 Length :2.1" (54mm) Hole Size:1" (24mm) Thread Size:3/4" (20mm) Surface Finish: polishing Package Includes: 1 Piece Boat Drain Plug Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!