Metric Screw Chek'r
This ingenious, threaded gauge quickly tells you size, threads per inch, tap drill size, clearance drill size, length and basic diameter. It even straightens bent screws and cleans up rusty or battered threads.
Made of heavy gauge, satin chrome plated steel. Instructions included.
Will identify screw sizes ranging from 8mm through 14mm in the I.S.O. pitches.