Thread Gauge Combo-Mini Thread Detective Thread Identifier / Thread Checker 20-1/2 in. L x 2 in. W Thread Gauge Features Set includes both Inch and Metric identifiers. Thread sizes are permanently laser etched on each gauge. All sizes are steel with a clear zinc finish and each gauge identifies both bolts and nuts. Takes the guess work out of thread size and pitch on nuts, bolts , screws, threaded holes and many other threaded items. Eliminates costly and time consuming repairs. Great for identifying and sorting nuts and bolts in fastener cribs, fastener bins at home or at your facility. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.