PRODUCT INFORMATION DESCRIPTION Mitutoyo 516-335-26 INCH Micrometer Inspection Gage Block SET of 9 CERAMIC Gage Blocks, Grade AS-1. SIZES=.0625", .100", .125", .200", .250", .300", .500", 1", 2"; Plus Optical Parallel Thickness=.5" SPECIFICATIONS Type:Inch CERAMIC blocks Details:Set of 9 and Optical Parallel Specifications:Grade AS-1