Feature:1. Upgraded Thread Checking Set: Every thread checker is inserted into well cut foam that holds them firmly in place to prevent them from bouncing around in the box, but not so tight that you can easily remove them. Easier to use than connected nut or thread checkers, because you no longer have to carry a whole bunch of gauges to measure individual screws or nuts and can reach any tight spot.2. Improved Efficiency: Just screw the nut or bolt into the screw thread gauge, it takes you a few seconds to check the size. Also, this nut and bolt gauge is especially well suitable for the distinguish between similar inch and metric threads.3. Aluminum Alloy: Nut and bolt thread checker is crafted from durable aluminum alloy ensuring long lasting use. Our nut and bolt checker set includes assortment of 44 nut and bolt size checker gauges for measuring thread pitch. Use the detachable nut and bolt gauges to check, identify and verify nut and bolt size.4. Nut and Bolt Size Guide Storage Box: Featuring clear nut and bolt labels, our gauge organizer box makes nut and bolt identification quick. Foam firmly holds gauges in place for organization. Blue aluminum plated for inch size. Red aluminum plated for metric size.5. Get Your Stuff Well Organized: This nuts bolts organizer can help you well and fast sort out your assorted nuts and bolts and get them well organized and neater in your compartment box from misplace and loss. A great little toolbox if you use fasteners a lot or have a box, drawer, stake, garage full of random nuts and bolts.Specification:Item Type: Nut and Bolt Thread CheckerMaterial: Aluminum AlloyWeight: Approx. 834.00g / 29.42ozFunction: Thread Inspection for Bolts and Nuts.Package List:44 x Nut and Bolt Thread Checker 1 x Black Plastic Box