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.
Carbide tipped drill bits are strong bits with high heat resistance used for high speed drilling by auto mechanics, locksmiths and machinists drilling into hardened steel. The bits are used to drill out broken bolts and drill bits and to drill into safes and through studs. They are best suited for industrial uses.