Specification Brand : Generic BulletPoint1 : What You Get: 30 pcs in one zipper bag BulletPoint2 : best to fit ID 5/16" To 11/32" 8-9mm hole BulletPoint3 : plug big OD 0.437" 11.1mm small OD 0.25" 6.35mm length 1" 25.4mm BulletPoint4 : Rubber Material Idea for most aggressive or concentrated acid and alkali solutions Chemical solvent for Powder and E.D. Coating, Painting, Cerakote, Anodizing, Plating, Media Blasting, Sealing ,Custom surface treatment and protection Supplies. BulletPoint5 : Material support for boiling Steam UV light alcohol immersion Autoclave Sterilization process for safe, clean and Reusable applications Color : Semi-transparent Department : unisex-adult ExternallyAssignedProductIdentifier1 : 0641320994152 ExternallyAssignedProductIdentifier2 : 641320994152 IncludedComponents : no ItemName : Lab Tapered Stopper Plug for 5/16" 8-9 mm Test Tube Hole (Pack of 30) for Paint Masking Surface Protection Dust Isolated Liguid Sealed Black Rubber ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 10 centimeters ItemPackageDimensions_Width : 8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-lab-rubber-stoppers Manufacturer : Protection Force Material : Rubber ModelName : 0437 ModelNumber : BESA NumberOfBoxes : 1 NumberOfItems : 3 PartNumber : BESA0437 Pattern : Solid ProductDescription : For any other seal size, material, type, custom molding and quantity discount price, Please leave message in bellow AMAZON-Customer questions & answers, Our online customer service will reply to you at once. ProductSiteLaunchDate : 2023-07-15T02:34:47.579Z Size : 8mm(5/16") SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1