Premium Stainless Steel Material: This durable sink plug strainer is a upgraded version after collect customer's advise for product improvement. The kitchen sink strainer plug is made of high quality stainless steel - well made, no rust and last for a long time. Dual Function Strainer and Plug: This new sink strainer plug can be used as a sink plug and sink strainer/filter at the same time. Press the knob dwon to fill sink as sink plug, and lift it slightly to drain the water and collect all the resideues as a strainer. Easy to Use: Our sink plug strainer is easy to remove and assemble. 10s is enough, just follow the guide to unscrew the center shaft first, and then assemble the accessories together. You can check the image-6 for details. Size: Please check the image-2 and image-3 for detailed size. The outside diamater of kitchen sink strainer is 78mm. The rubber seal diamater is 55mm, and the bearing-to-rim measurement is 30mm. Suitable for kitchen sink hole in 78.3-80mm. NOTE: Please make sure your sink strainer plug's diameter are the same as our product before placing the order!