Spurtar Tapered Feeler Gauge Dual Marked Steel Feeler Gauges Metric and Imperial Gap Measuring Tool (0.03-1mm, 32 Blades) The tapered end works well with those hard-to-get-to-valve tappets and buckets on performance motorcycles, ATV's, and UTV's valve adjustment needs. Dual marked 32 blades feeler gauge set is suitable for designers, engineers, and mechanics to measure the thickness of tappet clearances, spark plug gaps, bearing clearances and other hard to reach places. Specifications: Blades: 32 Blades Material: #65 manganese steel Imperial Measurement: 0.001inch to 0.04inch Metric Measurement: 0.