Brüder Mannesmann Spanners & Wrenches Shifter 617703 - Bruder Mannesmann M19873, The Brüder Mannesmann M19873 shifter is an adjustable wrench with a versatile 1-piece design. Manufactured by Brüder Mannesmann, this tool is ideal for gripping and turning various fasteners. It is typically used in automotive, plumbing, and general repair applications. Brüder Mannesmann M19873 Shifter 1-Piece Durable Quality Tool