HAND DRILL BIT (PCB BIT)
Hand drill bit have been used by many primitive societies as a fire drill to start a fire. It is still often learned as a useful survival skill. A hand drill bit could also be used as a tool for drilling holes in hard materials such as wood, stone, or bone. Generally, it is used in pcb (PRINTED CIRCUIT BOARD)
Large bits of similar shape are used for geological work, where a deep hole is drilled in sediment or ice and the hand drill bit, which now contains an intact core of the material drilled with a diameter of several centimeters, is retrieved to allow study of the strata .
A brace is a hand tool used with a bit (drill bit or auger) to drill holes, usually in wood. Pressure is applied to the top and the tool is rotated with a U-shaped grip.