Starrett DY455 Telescopic Gauge Set, Steel, 6 piece

Starrett Telescoping Gauge Set

A set of six precision gauges for internal measurements of holes or slots, size range 8 to 152mm/ 5//16 to 6in. Each gauge consists of a rigid knurled steel handle with a knurled contact locking screw. The contact points are precision ground to a radius to give proper clearance for the smallest hole the gauge will enter. Constant spring tension gives a uniform contact pressure to ensure measurement. Final size is measured across the contact points with a suitable instrument e.g. vernier caliper or micrometer (see this section).