Savior of round molds! Spinning chisel tool Flatten round hole bottoms with ease!A spinning chisel tool that has never existed before.Excellent for use as a thin-blade chisel tool. Installed on a pin vice body for flat processing of drill hole bottoms and use as a small chisel tool.A 5-piece set sizes from 1 mm to 3 mm.The shaft is standardized to 3mm, eliminating the need to replace the collet chuck of pin vises, resulting in easy replacement. *Please take extra caution when handling the blades, especially when opening the storage case or during use. ▼How to use1. Attach a drill blade to a pin vise to drill a hole.2. Attach a spin blade with the same diameter as the drilled hole to the pin vise.3. Flatten the bottom of the drilled hole with the spin blade. Flattening the bottom surface of a hole made with a drill blade of the same diameter (drilling edge processing) is possible.Standardized to shaft size 3mmSize range 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mmExcellent for use as a thin-blade chisel tool.