Each steel standard is 6" long x 1/2" wide Perfect for use in corrosive or high temperature environments and situations requiring good conductivity Includes vinyl storage envelope with individual blade pockets for quick reference SPI 20 Piece, 0.001 to 0.025" Thick, Parallel Feeler Gage Set 6" Leaf Length, 1/2" Wide, Steel. Ideal for use in the aircraft, power/utility, food, automotive, and marine industries. Perfect for use in corrosive or high temperature environments and situations requiring good conductivity. Individual blade pockets for quick reference.