This example I believe the gear was a part made specifically for clubs. But other designs were more improvised.
During the First World War all armies employed clubs for the purpose of trench raiding. This British trench club was made by sliding a special flanged metal head onto the standard entrenching tool handle. The head was designed and produced by the Royal Engineers of Second Army Workshops, from 1915 onwards. They are described in 'Work of the RE in the European War, 1914-19' as 'knobkerries'.