Sometimes the drills, especially in the already served, without distinction, the marking indicating the diameter. It would seem that to define it is only possible with a micrometer. But here’s a simple and fairly accurate method of measurement with… grip. Drill clamped in their jaws, and remaining between them a gap corresponding to the diameter of the already available ordinary ruler with millimeter divisions.
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- CLAMP? NOT A PROBLEM!
It is known that the easiest and most reliable method of connecting pipes with flexible hoses, with clamps, However, to find the latest is not always possible, and to do it with my hands...
This simple device will help with the help of ordinary hand drills to cut holes of any diameter in the plywood, hardboard and particleboard.