Combo Gauge - 3 gauges in one. Top gauge is a rivet gauge for sizing pop rivets from #3 to #8 diameters & blind threaded inserts from 6-32 to 3/8". This tool also has a handy 5" ruler. Next gauge is an internally threaded screw gauge in inch and metric & you can actually screw fasteners into this gauge. Size range is from #0 to 3/4" coarse and fine thread, & the metric range is from 1.6mm to 16mm. Last gauge is the drill gauge & is used to size drill bits. 7.5" L x 3.5" W x .5" Thick
