Each feeler gauge comprises a set of thin steel blades, hardened, tempered and polished within a steel case. All blades are marked with the thickness. Typical uses for these feeler gauges are measuring gaps between shafts and bearings, electrical contacts and the flatness of jigs and fixtures, etc.

387M: Blade Thickness x 0.01mm-Metric 3,4,5,6,7,8,9,10,15,20,30,40,50
388M: Blade Thickness x 0.01mm-Metric 3,4,5,6,7,8,9,10,15,20,30,40,50
391M: Blade Thickness x 0.01mm-Metric 5,10,15,20,25,30,40,50,60,70,80,90,100
391M: Blade Thickness x 0.01mm-Metric 5,10,15,20,30,40,50,60,70,80
390M: Blade Thickness x 0.01mm-Metric 5,10,15,20,25,30,35,40,45,50,55,60,65, 70,75,80,85,90,95,100
393M: Blade Thickness x 0.01mm-Metric 5,10,15,20,25,30,35,40,45,50,55,60,65, 70,75,80,85,90,95,100
395M: Blade Thickness x 0.01mm-Metric 5,10,15,20,25,30,35,40,45,50,55,60,65, 70,75,80,85,90,95,100
394M: Blade Thickness x 0.01mm-Metric 5,10,15,20,25,30,40,50,60,70,80,90,100
398M: Blade Thickness x 0.01mm-Metric 5,10,15,20,25,30,40,50,60,70,80,90,100
399M Blade Thickness x 0.01mm-Metric 5,10,15,20,25,30,40,50,60,70,80,90,100
124/3: Blade Thickness x 0.001" Imperial 1 ½,2,3,4,6,8,10,12,15,25
124/12: Blade Thickness x 0.001" Imperial 1 ½,2,3,4,6,8,10,12,15,25
132: Blade Thickness x 0.001" Imperial 1 ½,2,3,4,6,8,10,12,15,25
124/6: Blade Thickness x 0.001" Imperial 1 ½,2,3,4,6,8,10,12,15,25
492: Blade Thickness x 0.001" Imperial 1 ½,2,2 ½,3,3 ½,4,4. ½,5, 5. ½,6,7,8,9,10,12,15,20,25
493: Blade Thickness x 0.001" Imperial 1 ½,2,2 ½,3,3 ½,4,4. ½,5, 5.½,6,7,8,9,10,12,15,20,25
12: Blade Thickness x 0.001" Imperial 1.1/2,2,2.1/2,3,4,5,6,7,8,9,10,11,12,13, 14,15,16,17,18,19,20,21,22,23,24,25