- The sliding head may be adjusted to any position along the rule and locked by a thumb nut
- The head is beveled to 59° (the correct drill point angle), and is also graduated in 32nds along the 59° face for measuring the drill lips which should be of equal lengths
- The hook rule has accurate, machine-divided graduations in 8ths, 16ths, quick-reading 32nds and 64ths
- Hook is adjustable and can be shortened or extended on either side of the rule, and may also be removed if desired
- Tool can also be used as a Plain Rule, Hook Rule, Depth Gage, and Slide Caliper
- For quickly and accurately determining the correct drill point angle of 59° and the correct length of drill lips necessary for clean-cut drilling at maximum feeds and speeds
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