Stanley 32 Blade Metric / Imperial Feeler Gauge, 78-221

The Stanley 78-221 is a precision feeler gauge set designed to give you reliable, accurate gap and clearance measurements. With 32 hardened blades marked in both metric and imperial units, it’s ideal for engine tuning, mechanical fit checks, and withstanding rigorous workshop use.

Features & Benefits

• 32 blades spanning a wide range of thicknesses—each clearly etched with metric and imperial markings

  • 0.010 in Magnetic (0.254 mm) · 0.0015, 0.002, 0.0025, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.010, 0.011, 0.012, 0.01 3, 0.014, 0.015, 0.016, 0.017, 0.018, 0.019 , 0.020, 0.022, 0.023, 0.024, 0.025, 0.026, 0.028, 0.030, 0.032 & 0.035 in 0.178, 0.203, 0.229, 0.254, 0.279, 0.305, 0.330, 0.356, 0.381, 0.406, 0.432, 0.457, 0.483, 0.508, 0.559, 0.580, 0.610, 0.635, 0.711, 0.762, 0.813 & 0.889 mm)

• Hardened and tempered steel construction ensures durability and consistent performance under regular use 

• Lock nut mechanism allows you to fix one or more blades securely in place during measurement 

• Compact folding design keeps blades organized and protected

• Dual-scale (metric & inch) blades make it easy to use across different specs and standards

Typical Uses

• Setting valve lash or clearances in internal combustion engines

• Measuring spark plug gaps or distributor point clearances

• Checking and adjusting tolerance gaps between mating components

• Precision verification on fixtures, jigs, and mechanical assemblies

• General mechanical, automotive, and millwright work

*Product images are for illustrative purposes only and may differ from the actual product.