Draper 20-Blade Metric Feeler Gauge Set Work with accuracy and precision with this quality metric feeler gauge set, including 20 long tapered blades. Each blade is hardened and polished for long-lasting quality, and clearly marked with its size. The set folds neatly away into a steel case for easy storage in your toolbox. 20 x 100mm tapered blades (0.05‒1.0mm) Hardened and polished Fold into polished steel case with thumbscrew