S&W Nut & Bolt Inch Thread Checker - Model: SWTC-S21
Well suited for distinguishing between similar inch threads. The individual gauges rotate freely on the wire cable for fast verification. Includes: (21) Sizes: #6-32, #6-40, #8-32, #10-24, #10-32, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 5/8"-18, 3/4"-10, 3/4"-16, 1"-8 & 1"-12