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 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 Tool can also be used as a Plain Rule, Hook Rule, Depth Gage, and Slide Caliper.