Thread guide M/G 60 degrees/BSW 55 degrees no. of blades 52 PROMAT6Y169509
Stahlwille 12665 52 Screw Pitch Gauge 0.25-6mm 52-BladeG1535.000.052
Gedore 706 Thread Guage 0.25-6mm 8-BladeG2881.001.770