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.024 drill bitsize

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.024 drill bitequivalent

For a second test, hold the bit in your hand with the tip pointed down and away from you. Turn the bit in a clockwise rotation and watch the reflection of any light on the bit. If the light moves up the bit as you turn it, you are holding an up-cut bit. The light will move downward on a down-cut bit.

First, look at the right side of bit (it doesn’t matter whether the tip is facing up or down). Look at what direction the flute is heading as it goes around to the backside. If the flute is moving up as it cuts around the right side of the bit. You are looking at an up-cut bit.

You have an up-cut spiral bit and a down-cut spiral bit on your cabinet shelf but haven’t used them in a while. How can you tell quickly which is which?