Do not twist. Allow full side of bit to do cutting. For control - postition motor tool firmly in hand as if holding a pencil. DO NOT hold from back of motor tool. When drilling, bring bit in and out of hole to remove excess material.
Bit spins on excess material and heats work piece.
Bits A quality precision bit is totally predictable, giving you consistent results time after time. Quality in function and durability are important. Cheaper bits will not work as well because of the special geometry of the bit and high quality of carbide used. Fishtail point will continue to drill after other types of drill points are dull. The special design allows the bit to cut using the side of the bit without chatter or chipping.