VERY CHEAP - Metalworking & Multipurpose Drill Bits
The first time these bits were used on chain link fence posts which are not very thick, two bits burned unusable even with cutting fluid and require a full refund.
Pros
Wide Application: The step drill bit set is very useful for drilling, reaming, marking and more, also suitable for chamfering various kinds of materials such as wood, plywood, aluminum, iron, copper, fiberboard. , chipboard, plastic, PVC board and many other sheets of metal