Product Description Technical Information:Material:Aluminium 6061Size:52 mmDiameter:6 mm (restriction to 5 mm for placing tools, pumps, etc.)Compatibility:Presta valveFeatures:suitable for Sclaverand/Presta valveswith O-ring to combat air lossContents:2 x KCNC valve extenders Manufacturer: KCNC International No. 5 Alley 1 Lane 123 Section 6 Mingzhong Rd Taichung Taiwan info@kcnc.com.tw Distributor: COOOLsport HandelsgmbH Feistritz 29 8843 St. Peter am Kammersberg Autriche info@cooolsport.com