#6 Centering Head Standard 4″ Y-type head and an adjustable dial bubble protractor (DSL)
Made of aluminum with a hardened steel pin. It has a 4″ angle spread (Y-spread) and can be used from 1/2″ and larger. It is used most often for finding top dead center or bottom dead center on pipe. You can use it to find the location of other ordinate lines on the sides or at different angles. Once you have established these points you strike the pin with your hammer.
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