Model A308. Model : A308. Sub-Type Feeler Gauge. Type Offset Valve Tappet Gauge Set. Sub-Type : Feeler Gauge. Type : Offset Valve Tappet Gauge Set. 11 Blade Sizes – (.004″/.102mm), (.005″/.127mm), (.006″/.152mm), (.007″/.178mm), (.008″/.203mm), (.009″/.229mm), (.010″/.254mm), (.011″/.279mm), (.012″/.305mm), (.013″/.330mm), (.014″/.356mm).