Makita DHR242RMJ 18v SDS+ Rotary Hammer Drill - Data Powertools The DHR242 model is a 24mm (15 16") Cordless Combination Hammer powered by an 18V Li-ion Battery, featuring an efficient Brushless DC motor that provides higher productivity than that of the 18V Cordless Combination Hammer model BHR202 Able to drill in concrete as fast or faster than the 24V Cordless Combination Hammer model BHR200 Makita’s first Cordless Combination Hammers now also have