SPT37 Draper Tools Spark Plug Tools Draper 18 Blade Metric & Imperial Feeler Gauge Set Combination g auge with eight metric & ten imperial 75mm long blades hardened & polished for long accurate life. Each blade is marked with its size & folds into a plated steel case with thumbscrew. Blade
Sizes: 8 metric blades
Size: 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.40 & 0.50mm 10 imperial blades
Size: 0.0015, 0.002, 0.003, 0.004, 0.006, 0.008, 0.010, 0.012, 0.015 & 0.025.