12” long by 1/2” wide blades. Professional quality tool by Lang Tools. 0.021”, 0.025”, 0.027”, 0.030”, and 0.040”.
Eastern Tool USA FG-26-6" long Feeler Gauge GAGE BOEING AIRCRAFT FACTORY SURPLUS
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Proto 1/2" x 12" 25 Blade Long Feeler Gauge Set with Steel Blade Holder J000TL
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Vintage MAC Tools Long Feeler Gauge Set FG009 Made in USA