18 in. sampler with standard adapter and round shank for electric operation. 3/8 in. round shank adapter for use with electric drill (electric drill of 1/2 hp or 18-volt capacity is recommended). A dowel plunger is supplied with each unit to remove moist or packed samples. Shank adapters are quickly and easily removed from the tube by depressing a spring-loaded plunger. Fitted with replaceable hardened cutterhead and adapter.