Ignition Wire Feeler Gauge Set, Thickness Range 0.013 in to 0.04 in, Number of Feeler Blades 10/ BLADE LENGTH: 1.750 INCHES NOMINAL BLADE QUANTITY: 10 MEASUREMENT SYSTEM: ENGLISH BLADE TIP WIDTH: 0.250 INCHES NOMINAL BLADE GROUP QUANTITY: 2 BLADE LOCK: NOT INCLUDED BLADE THICKNESS: 0.0130 INCHES BLADE THICKNESS: 0.0150 INCHES BLADE THICKNESS: 0.0170 INCHES BLADE THICKNESS: 0.0180 INCHES BLADE THICKNESS: 0.0200 INCHES BLADE THICKNESS: 0.0250 INCHES BLADE THICKNESS: 0.0300 INCHES BLADE THICKNESS: 0.0320 INCHES BLADE THICKNESS: 0.0350 INCHES BLADE THICKNESS: 0.0400 INCHES BLADE SHAPE: STRAIGHT SPECIAL FEATURES: BLADES ETCHED WITH DECIMAL AND METRIC EQUIVALENTS