Very nice little automatic centering basket. It's more likely to be carried in my pocket and is perfect for the smaller, softer materials (polycarbonate, styrene, brass, etc.) I usually work with. I have two full size automatic punches, but they are too big to carry around and tend to break plastic parts. This works fine. The replaceable tip has a standard 1/8 inch diameter. From old bars I make extra tips for cutting millstones - I grind a small groove, add a coil of spring wire and make myβ¦