Telescoping Gauge Set - 5/16 - 6in

The Telescoping Gauge Set - 5/16 to 6 inch Range by COMP CAMS is a precision measurement tool designed for mechanics, machinists, and engine builders who require accurate bore and hole sizing across a broad range of diameters. This six-piece set eliminates the need for multiple individual gauges, making it an efficient choice for both professional shops and serious hobbyists working on engine blocks, cylinder heads, and precision machine work. Whether you're verifying bore diameters, checking counterbore dimensions, or confirming hole sizes during engine assembly or machine restoration, this telescoping gauge set delivers the versatility and repeatability essential to quality workmanship.

Telescoping gauges operate by expanding an internal contact arm to precisely match the inner diameter of a hole or bore, then locking in place and measuring against an external micrometer or caliper for exact dimension confirmation. The 5/16 to 6 inch range covered by this set's six gauges eliminates measurement gaps and provides continuous coverage for the most common sizes encountered in automotive and machine work. Each gauge features smooth telescoping action, reliable locking mechanisms, and hardened contact points that resist wear while maintaining accuracy through repeated use in demanding production and restoration environments.

This set is ideal for engine builders verifying OEM specifications, machine shops performing quality control inspections, and technicians restoring classic or performance engines where bore consistency directly impacts compression ratios and engine reliability. The compact design and modest 1.1 lb weight make the set portable for on-site diagnostics, field work, or use across multiple workstations. Proper technique—expanding the gauge inside the bore, locking firmly, and comparing to a calibrated micrometer—ensures measurements accurate to within thousandths of an inch, meeting the precision standards required for modern engine work and machine tool assembly.