Internal alignment unit is designed for the measuring of bores and bearings in internal combustion engines. It is also designed for the alignment of work pieces to a boring head. It offers true bore center measurement, not just bore straightness. It measures whether multiple bores are in line with one another and with the rotating centerline of the shaft.

Internal coatings are used to increase flow efficiency for natural gas pipelines and other anti-corrosion applications. Improved flow conditions may enable use of a smaller pipe or allow for lower compression requirements. Internal coatings are designed to improve barrel performance by creating a slick surface for the paintball to travel over. Some internal coatings are designed to also protect the inside of the barrel from scratches. This internal coating incorporates teflon and ceramic to create a hard and very slick surface. All barrels should be mirror/micro polished internally to say the least.