1) Stainless steel glass door knobmade from stainless steel with various finishes for customer's option. Itmeetsyour requirements of installation and allows comfortable and secure grip in the condition of humid bathroom. 2) Spec a. Length: 30mm+ X + 30mm b. O.D. =28.5mm c. Hole: M6 threaded hole 3) Material: We offer qualified stainless steel 304 or 316 as per American standard (AISI). Test report of material is available upon your request. 4) Finishing: polished / mirror polished, satin / brushed / matt. 5) Other info: a. ISO certificate: We was certified TUV ISO 9001-2000 in 2003, and certified TUV ISO 9001-2008 in 2009. b. Export percentage: 81 - 89% of our products are for the export. c. Inspection: 100% of our products have inspection at our factory before delivery to the port. 6)Table of Chemical Composition (%) Material: S.S 304 CarbonSiliconManganesePhosphorousSulfurNickelChromeMolybdenumRange ≤0.08≤1.00≤2.00≤0.045≤0.03≤8.00-11.0≤18.0-20.0Material: S.S 316 ≤0.08≤1.00≤2.00≤0.045≤0.03≤10.0-14.0≤16.0-18.0≤2.0-3.0