The 10-piece set consists of two steel plates with holes for checking the diameters.
Tile dimensions approx. 150 x 80 mm x 1 mm.
metric plate fi / mm 1 / 1.5 / 2 / 2.5 / 3 / 3.2 / 3.5 / 4 / 4.2 / 4.5 / 4.8 / 5 / 5.2 / 5.5 / 6 / 6.5 / 7 / 7.5 / 8 / 8.5 / 9 / 9.5 / 10 / 10.5 / 11 / 11.5 / 12 / 12.5 / 13
inch plate fi / ": 1 / 16.5 / 64.3 / 32.7 / 64.1.8 / 9 / 64.5 / 32.11 / 64.3 / 16.13 / 64.7 / 32, 15 / 64.1 / 4.17 / 64.9 / 32.19 / 64.5 / 16.21 / 64.11 / 32.23 / 64.3 / 8.25 / 64.13 / 32.27 / 64.7 / 16.29 / 64.15 / 32.31 / 64.1 / 2
The set includes drilling depth limiters, steel with a locking screw fi 3/4/5/6/8/10/12 mm and one 1.5 mm Allen key. 
Gauges are used for quick initial checking of external diameters / e.g. drills, rollers, rods, wires, etc.
Ring-shaped drilling depth stops, when fitted to the drill, enable precise control of the depth of the drilled hole.
Put the limiters on the drill, setting the appropriate drilling depth / the ring should be locked on the drill / when checking the diameter of the tested element (e.g. nail, rod, roller), insert it into a hole where it can be moved with minimal play.
The diameter is marked on the plate next to the hole.