Question

which of these bits is used to bore holes in metal stock? a twist b spade c forstner d countersink

Explanation:

• Twist bit: It has a helical - shaped flute that helps in removing chips while drilling. The pointed tip and the cutting edges are designed to cut through hard materials like metal.
• Spade bit: Typically used for drilling in wood. It has a flat, paddle - like shape with a sharp cutting edge. The design is not suitable for metal as it may not handle the heat and stress well during metal drilling.
• Forstner bit: Used for creating flat - bottomed holes in wood. It has a unique cutting edge design that is not ideal for metal. Metal drilling requires a bit that can handle high temperatures and has good chip - removal capabilities, which Forstner bits lack for metal.
• Countersink bit: Used to create a conical hole (countersink) in a material. Its main purpose is to allow the head of a screw or bolt to sit flush with the surface. It is not primarily for drilling through - holes in metal stock.

Answer:

A. twist