RS PRO Telescopic Bore Gauge, Chrome, 6 piece

The RS Pro telescopic hole gauge set. Each of the six chrome gauges is designed to provide a high level of precision in machining and fabrication application. To use, simply expand the gauge inside the hole youre measuring and lock the plungers in place using the locking screw at the bottom of the handle. Then remove the gauge and measure the distance between the ends of the locked plungers using a micrometre or a caliper to determine hole size.Telescopic hole gauges provide easy and accurate measurement of hole diameters and slot widths Two plungers under equal and constant spring pressure can be locked between the walls of a slot or across the diameter of a hole Component size is determined by measuring across the locked plunger ends using a micrometre or caliper Plunger ends are radius ground and hardened Knurled plunger locking screw located a bottom of handle Gauge body and plungers have satin chrome finish