The PC70THD 1/2-in. corded two-speed hammer drill weighs only 5.1 lb and is 14.25 in. long, allowing the lightweighttool to be used in tight spaces. Its 7-amp motor has variable speeds of up to 1,100 rpm and 3,100 rpm. The hammer drill can be used in drilling concrete, tile, brick and mortar block. A molded handle is intended to reduce user fatigue, while metal gear housing aids in dissipating heat and extending the life of the hammer drill. Porter Cable; 888-848-5175; www.portercable.com Milwaukee's new test-and-measurement lineup is expanding since the segment was introduced a few years ago. The latest addition
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.