The head is beveled to 59 degrees (the correct drill point angle). It is also graduated in 6 inches along the 59 degree area to measure the drill lips, which should be the same length The hook ruler has precise machine split scale in 0.12 inch, 0.08 inch, quick read 0.03 inch and 64 inch. The hook is adjustable and can be shortened or extended on both sides of the ruler and can also be removed if desired This gauge has been specially developed for use in drill grinding. It allows for quick and accurate determination of the correct drill tip angle of 59 degrees and the correct length of the drill lips required for clean drilling at maximum feeds and speeds.
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