Complete rubbish, don't waste your time and money.
I was trying to drill a hole in a piece of wood and the drill bit just touched the wood and it fell apart. The product description is complete nonsense. I would return them but it's not worth the cost of gas to get to Koli and my timeπ‘
Pros
Application: Ideal for machining PCB, CNC, plastic fiber, carbon fiber, hardwood, PCB and other precision parts.