GRIP Thread Pitch Gauge 4-42 SAE .25-5.5MM Sizes Screw Tap Hole Tools 35428 Use as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole Saves time, in that it, removes the need to measure and calculate the thread pitch of the threaded item 60 degree thread profiles and locking devides Measures thread counts from 4 to 42 SAE and .25 to 5.5 MM