Standard Replacement:These sink strainers are compatible with most standard 3-1/2 inch kitchen sink drains in the USA. The sink drain strainers require a narrow rectangular center hole. For further details, please refer to our provided picture. Tip: Just be mindful of is ensuring the center shape of sink is rectangular and checking the size/diameter of the sink drain, and then you're all set. Strainer or Stopper:These Kitchen sink strainers can function as either a sink strainer or a sink stopper with a simple push or pull operation. To allow water to flow through, pull and twist the kitchen sink stopper, transforming it into a kitchen sink strainer that efficiently drains water. To utilize it as a sink drain stopper, align the knob with the hole and push it all the way in; it will then as a kitchen drain stopper. Fast Drainage:The kitchen sink drain basket features appropriately sized holes to swift drainage while effectively capturing food waste, scraps, and other debris from entering the drain. When twisted 90 degrees,the drain catcher sits slightly higher, enabling water to pass through and filtering out food debris and particles to prevent clogging. Secure Seal:When pushed down, the sink drain strainer converts into a kitchen sink stopper. The sink stopper kitchen drain includes a rubber bottom that aids in preventing clogs in the plumbing system. The kitchen sink plug tightly seals the water, facilitating sink filling for washing and soaking purposes. Colour:silver Material:Stainless steel Package Contents: 2 x sink drain strainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.