Genuine Hitachi HiKOKI 999100 Carbon Brush Set supplied as one pair for selected CF18, DH14, DH18, DH24 and WR18 cordless power tools. These replacement motor brushes maintain electrical contact with the motor's rotating commutator, helping provide consistent power during operation. Carbon brushes are a consumable motor component and can wear through normal use, making this genuine replacement pair ideal for replacing worn or damaged original brushes in compatible Hitachi HiKOKI tools. HiKOKI documentation specifically identifies 999100 as the required carbon brush code for several of these models.