6.4mm (1/4") wide gauge blades can be used to check valve clearances of small-diameter bucket and shim-type valve trainsStandard 12.7mm (1/2") wide blades may contact the cylinder head and not provide the proper clearance14-pc. set of 101.6mm x 6.4mm (4" x 1/4") feeler gauge blades, SAE thickness .002" .015"Blades are stored in a bi-fold pocketed vinyl pouch with a hook-and-loop closure101.6mm (4") length allows for extra reach to recessed valve systemsStraight blades can be bent by the technician for custom applications