In metalworking, a "drift" is a tool used to enlarge or shape a punched hole to a specific dimension.

: Often made from high-carbon steel like coil springs . The Process : Heat : Bring the steel to a bright yellow heat.

Watch the step-by-step process of forging a tool-steel drift:

: Perform a "midbar upset" to thicken the section where the hole will be.

: Work the piece from a square profile to an octagon and finally to a round or specific eye shape (like for an axe).

: Forge a long taper at one end to enter the hole and a shorter taper at the other for striking.