Specification Brand : Chemglass BulletPoint1 : This ball joint pinch clamp is made of stainless steel with bright, polished finish for years of -impervious use BulletPoint2 : Design------the pinch clamp are designed to securely hold spherical or O-ring joints together;The forked-shaped jaws supply uniform compression for leak-free seals,it is quite important for vacuum apparatus;The screw type locking nut with progressive springs provide the maximum security for holding the jointed glassware. BulletPoint3 : Used in a vacuum line connecting the manifold with cold trap or other high vacuum apparatus BulletPoint4 : Clamp 50# fits 50/30 spherical joints or 30# O-ring joints. ItemName : Chemglass Clamp, 4000mL Flask Holder; Clamp, 4000mL Flask Holder ItemPackageDimensions_Height : 3 centimeters ItemPackageDimensions_Length : 22 centimeters ItemPackageDimensions_Width : 8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-lab-clamp-holders Manufacturer : Chemglass Material : Stainless Steel ModelNumber : ASCC0050 NumberOfItems : 1 PartNumber : ASCC0050 ProductDescription : Chemglass Clamp, 4000mL Flask Holder; Clamp, 4000mL Flask Holder ProductSiteLaunchDate : 2017-01-03T19:45:39.529Z Size : For 50/30 Ball Joint Style : Modern UnspscCode : 31162900