Description Description: Made of high quality stainless steel 316, durable and stable Screw type drain plug with a o-ring washer for positive sealing,Retention system prevents plug from getting lost when removed Mounts in a 1/25mm diameter hole in hull,Twist turn -Fully adjustable will not leak or jar loose under vibration The plugs prevent all water from intruding into the kayak and will keep you dry out on the water Great accessories for boat transoms, fish wells, ice chests, yacht and more Specification: Length 42mm/1.65inch, diameter 25mm/0.98inch Elliptical surface 50x37mm/1.97x1.46inch Package Includes: 1 Piece Boat Bung Drain Plug 2 Pieces Screws(2 Pack) Note: Transition: 1cm=10mm=0.39inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!