Provides a quick accurate way for determining the correct drill point angle of 59° and the correct length of drill lips. Head is beveled to 59°, graduated in 32nds. Blade graduations - 8ths,16ths, Quick Reading 32nds, 64ths. Sliding head can be adjusted and locked by a thumb nut. Hook can be be adjusted or extended on either side of rule or removed. Can also be used as plain rule, hook rule, depth gage, and slide caliper.