Getrasport Disc Measuring Gauges SGT Quick Check - Check the competition discs using the Getrasport Disc Measuring Gauges SGT according to the tolerances of Rule 189. The measurements include disc diameter, height, core diameter, and ring diameter. The SGT gauges are easy to handle. To check the compliance of the disc diameter, place the competition disc on a hard and flat surface. Then, position the disc templates over the sports equipment. The template should be aligned parallel to the surface above the disc. - Product details - Material: Aluminum - Dimensions LxWxH: 25x11.5x1.1 cm - Weight per set: approx. 0.2 kg.