Product Description Spacer for the quick release from tubus Models:Version 15 mm Dimensions:15.0 x 3.2 x 6.2 mmManufacturer Number:71497 Version 20 mm Dimensions:20.0 x 6.0 x 5.5 mmManufacturer Number:71499Contents:1 x tubus spacer Manufacturer: tubus carrier systems GmbH Virnkamp 24 48157 Münster Germany contact@hebie-group.com