tenluno Thread Checker Nut & Bolt SWTC-44 Bundle Thread Checker Nut and Bolt Checker 44 MaleFemale Thread Identifier Gauges - 23 Inch & 21 Metric Sizes

This is kind of expensive but well worth the money if you have a nut and bolt bin that you have to dig through. This has saved me so many trips to the hardware store and moving back and forth on anything I was working on. Finding the right fastener quickly makes the price of this well worth the cost.

Need for restoration of older vehicles so I could identify fasteners. I use this way more then expected as it’s so handy because some cars use inch and metric on them. So after buying incorrect bolts a few times this now saves me money and time.

easy to used and verry durable

First time I went to use it to check O2 sensor thread it wasn't there. Metric appears to be lacking 9 sizes. I understand the Odds maybe, but it shoulda had M18, M22 and 7/8.Standard sides does better, only 4 lacking, but I do use M18, 7/8 and M22 often enough that I will miss them. I'm betting there are also thread pitches this is lacking as well but don't know yet.Lacks-M9, M11, M13, M15, M17, M18, M19, M21, M22, M23Lacks-11/16,13/16, 7/8 and 15/16.Metric side black metal is very readable but the silver metal side w same font color is much harder to read.My O2 sensors are M18-1.5

Good Quality and a very handy tool to have around. Saves a lot of time. Enabled me to bring some order to a very big mess of nuts, bolts and screws.