Product Description For a firm hold: the 1729-TA Hollow Axle Adapter by ParkTool Sliding adapter for the PRS-20, PRS-21 and PRS-23 repair stands to accommodate wheels with 12 mm or 15 mm thru-axle. Compatibility:PRS-20PRS-21PRS-23wheels with 12 or15 mm thru-axlesManufacturer Number:1729-TA Contents:1 x ParkTool 1729-TA sliding thru-axle adapter Manufacturer: Park Tool Company 1185 Eagle Lake Rd Shoreview MN 55126 USA info@parktool.com Distributor: GROFA Action Sports GmbH Otto-Hahn-Straße 17 65520 Bad Camberg Germany info@grofa.com