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A rotary hammer drills holes in concrete; a demolition hammer breaks concrete. Rotary hammers use SDS-Plus bits for holes up to about 32mm, and bigger SDS-Max models drill up to 38mm. Demolition hammers (breakers) only chisel, and hit much harder: around 40 to 50 joules for the DongCheng and Ingco breakers below. Below are the 14 rotary and demolition hammers in stock at GZ Industrial Supplies branches in Lagos, Abuja and Port Harcourt, with their power, impact energy and drilling capacity. Pric …