Recently we had the honor of working for one of the Duke power sub contractors in North Carolina.
Carolina Precision Core Drilling core drilled 18 four inch holes 24 inches in depth in 2 substation foundation walls. We used the standard 1 1/4" x 7 tpi thread core drill hub and extension to do complete this core drilling task as well as our trusted 4004-2- model Milwaukee Core drill motor and our very own custom core drilling rig to average core drilling 24 inches and moving to the next hole every 23 minutes.
