Boat garboard drain plug fits 1inch hole,nut plugs need to be disassembled with such as wrenches or pliers,tapered pipe threads water fit. Transom drain plug is made of high quality material,rust proof and anti oxidations, durable in saltwater circumstance,high surface for mirror-like appearance and to match modern watercraft,boat,yacht. Boat drain plug kit fits 1 inch hole,2 inch flange diameter,1 or 2 inch NPT Thread (External thread is 0.8 inches) Stainless steel drain plugs,maintain sealing under vibration conditions,great accessories for boat transoms,fish wells,ice chests,,yacht and more. Marine drain plug kit,with mounting screws color:Silver Material:Stainless steel Package Contents: 1 x Drain Plug(with Screw) Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.