The stainless steel jar cap with a silicone sealing ring is suitable for 86mm wide mouth Mason jars.SpecificationJar Cap:Color: Silver ToneMaterial: Stainless SteelInner Diameter: 86mm/3.4"Size: 90mm x 18mm/3.5" x 0.7" (OD*H)Sealing Ring:Color: TranslucentMaterial: SiliconeThickness: 3mm/0.1"Inner Diameter: 71mm/2.8"Packing List: 1 Set - 5 x Jar Caps and 5 x Sealing RingsAdvantage1. The can cap is made of durable stainless steel material with a silicone sealing ring, which is sturdy, waterproof, rust-proof and not easily deformed.2. The edge of the Mason jar lid is designed with non-slip ribbing for easy opening and tightening of the jar cap.3. The jar lid has a good tightness to keep your contents fresh, and it is great for the wide-mouth jar to dry storing or freeze in the refrigerator.InstructionEasy to use - just install the caps on the jar mouth and tighten it to seal.NOTE: Make sure the right size you need before ordering. Manual measurement allows 1mm-2mm of error.