Bore measurement is one of the most common measurement tasks required of metrologists. Whether working in machining, aerospace, engineering, or any other number of industries, holes or bores are involved. What is less commonly known about bore measurement are all of the non-standard situations in which bores need measuring. Perhaps you are working with a bore that is angled partway through, or one in the shape of a dovetail. There are a number of unique bore circumstances that get overlooked in the world of specialized tools. Well, Fowler and Bowers wanted to amend this situation and so they created their line of XT specialty heads to help you measure bores of all shapes and sizes. The caliper and gauge heads in the XT specialty collection are designed for a number of non-standard bore measurements in order to help you solve any problems you may be encountering on the job.