If You Want Different Dimension Of White O Ring Seal , Please Click on The Proper One As Belows: Thickness Outdoors Diameter (Outdoors Dia.= 2 x Thickness + Inside Dia.) 1mm 4mm-17mm 18mm-35mm 1.5mm 4mm-10mm 11mm-23mm 24mm-42mm 2mm 6mm-21mm 22mm-37mm 38mm-60mm 62mm-120mm 2.5mm 7mm-20mm 21mm-34mm 35mm-48mm 50mm-85mm 90mm-150mm 3mm 10mm-24mm 25mm-39mm 40mm-60mm 62mm-120mm 125mm-200mm 3.5mm 12mm-25mm 26mm-39mm 40mm-54mm 55mm-82mm 85mm-140mm 145mm-200mm 4mm 15mm-27mm 28mm-40mm 41mm-55mm 58mm-92mm 95mm-155mm 160mm-220mm 5mm 15mm-27mm 28mm-52mm 55mm-100mm 105mm-160mm 165mm-220mm 5.7mm 30mm-75mm 80mm-125mm 130mm-175mm 180mm-220mm LUJX-R 20pcs White Silicone O Ring Seal 3mm CS O-ring Gasket OD 10 11 12 16 17 18 20 21 24mm Meals Grade Sealing Washer O Grommet Product Title: 3mm O Ring Seal Materials: Silicon Colour: White Thickness: 3mm Dimension: Outdoors Diameter x Inside Diameter x Thinkness Work temperature: -35 diploma to 200 diploma Grade: Meals grade Hardness: Shaw's 55 diploma Tolerance:Handbook Measurement Permits Little Bit Error Reminder: The Portions Per Pack Might Have An Error About 1% Bundle:20pcs Per Pack For Your Selection