Wegener also noted that the continents move up and down to maintain equilibrium in a process called isostasy. As an example he cited the sinking of Northern Hemisphere lands under the weight of continental ice sheets in the last ice age, and their rise since the ice melted some 10,000 years ago.
Drill that is fitted with a Pipe provides effective connection to the rig surface equipment or application with the bit and the bottom hole assembly for the purpose of pumping the Drill fluid to the bit.
Drill Bits & Driving Tools. Drill bits and driving tools help hand tools and power tools work together, especially important for the variety of drilling tasks that get done in woodworking. We are always on the lookout for unique and useful hand drills and power drills, screwdrivers and socket sets, or a handy gadget that will help you become a better woodworker.