1.SizeThe installation diameter(plug size) of the pop up basin sink waste filter is 37mm, and the rubber washer is 41mm in diameter, it fits for 38mm~41mm sink holes,Before Purchasing: please make sure your wash basin sink drain hole size is between 38mm to 41mm. . 2.MaterialStainless steel bodywith chorme finish, brass mechanism. the push type plug is sturdy, durable and has good bounce and rebound strength. . 3.Two Models SwitchPress the top cap down gently to switch 2 modes stopper (to keep water) and strainer (to drain off water). . 4.Build-in StrainerThe sink plug with an anti-blocking basket strainer inside which can collect hairs and prevent the drain from clogging up, achieving effective filtering, fit for bathtub, bathroom basin, kitchen sink and more. . 5.Easy to install and CleanInstallation is easy: Pull the plunger or the flicky one out and this slots straight into the hole Cleaning is easy: Twist the top and the mechanism will pop out and and you can get out all of the crud. . Package Contents: 1 x sink stopper Contains only the above package contents and does not include other products. NOTE: Lighting and different monitors may cause the color of the product in the picture to differ slightly from the actual product. Measurement error is +/- 1-3 cm.