Bosch Impact Control x3 Pc 1/2\" Socket Set 2608551102 This 3-piece Bosch socket set comes in a protective pouch for safe storage and transportation. CONTENTS 1x 17.0mm Socket 1x 19.0mm Socket 1x 21.0mm Socket 1x Velcro Storage Pouch FEATURES Impact control - highly robust for heavy-duty screwdriving applications with impact wrenches (and impact drivers with an adaptor - sold separately) S2 modified steel and an optimised heat treatment process provide extra-tough endurance for high performance SPECIFICATION Diameters: 17mm, 19mm, 21mm Length: 85mm Shank: 1/2\" Part Number: 2608551102