Feeler Gauge Set, Thickness Range 0.003 in to 0.018 in, Number of Feeler Blades 9/ BLADE QUANTITY: 9 BLADE SHAPE: STRAIGHT MEASUREMENT SYSTEM: ENGLISH BLADE GROUP QUANTITY: 1 BLADE LOCK: NOT INCLUDED BLADE THICKNESS: 0.0030 INCHES BLADE THICKNESS: 0.0040 INCHES BLADE THICKNESS: 0.0050 INCHES BLADE THICKNESS: 0.0060 INCHES BLADE THICKNESS: 0.0080 INCHES BLADE THICKNESS: 0.0100 INCHES BLADE THICKNESS: 0.0120 INCHES BLADE THICKNESS: 0.0150 INCHES BLADE THICKNESS: 0.0180 INCHES SPECIAL FEATURES: SHORT BLADES; ETCHED WITH DECIMAL AND METRIC SIZES SUPPLEMENTARY FEATURES: INDUSTRIAL QUALITY (IQ) TOOLS PROGRAM ITEM