Birzman specialist 4 piece wrench set mtb the specialist wrench design utilises a simple and yet ergonomic shape in concert with hard wearing materials cro moly steel and tpr to create a highly functional durable and attractive design for shimano sram fsa system comprises of 1x pedal wrench 1x 9 speed freewheel turner 1x bottom bracket wrench 1x freewheel remover 1x module wrench extender