Sufficient Quantity: You will receive 100pcs rubber washers in 4 different sizes: 30*10mm, 24*7mm, 20*10mm, 18*8mm (outer diameter x inner diameter), and the thickness is 2mm. Enough quantity to meet your daily use and replacement needs Quality Materials: Flat rubber washers are made of premium rubber material, which is flexible and elastic, sturdy and durable, ensuring no scratches left. The rubber grommets are not easy to loose, providing you a long time service life Practical Functions: This rubber washers for screws feature leak-proof sealing and shock absorption, which are important to prevent water, air or anything else from leaking. In addition, it can be vibration damping pads for household appliances Easy to Use: These faucet washers for bolts are simple to use, no extra tool needs for installation. Just need to cut off water valve controller, then twist off faucet and replace the old rubber washers. So effortless and easy to use Wide Applications: Black flat rubber washers assortment kit can be used to replace old or damaged rubber grommets on shower door handles, towel bars. Rubber grommets bring much convenience for you and which is practical in our daily life