Offering 400 lb-ft torque, Fairmont Models H8508-1/1V/2/2V turn at up to 6,500 rpm and drill holes through hardened treated wood poles in seconds. Moderate-speed Models H8508-3/3V offer 280 lb-ft max torque and deliver optimal control. While 1/2 in. square drive is standard on select models, 7/16 in. hex quick change chuck on others facilitates and accelerates switch from drilling to driving. All models incorporate twin-hammer impact mechanism, Super Spool selector, and forward/reverse button.