Highly durable AHB (Alloy housing body) - solid die cast alloy chassis ensures structural rigidity under heavy loads preventing the motor moving out of alignment. Carbon brush rotation system provides forward/reverse bias of carbon brushes to create maximum power in either rotation direction. Powerful 860 Watt motor. Safety slip clutch. Quick switching between impact and non-impact. Variable speed with 2-speed gearbox. Soft grip handle. Heavy duty steel cased 13mm keyless chuck.