This is a genuine replacement part sourced directly from the manufacturer. The carbon brush is found in Hitachi rotary hammers and impact wrenches. This item includes two carbon brushes, which are used to carry electricity to the armature in the field assembly. You will require a screwdriver when replacing this item. This part is a common wear item, so you may wish to order a spare.
This is an authentic Hitachi replacement part manufactured for use with pneumatic nailers and other power tools. O-rings are typically used to form a seal between two assemblies. This o-ring is a versatile part and is used in various types of tools. The o-ring is sold individually, please see model diagram for part location and usage.