Fowler 53 672 081 Steel Shop Blox Rectangular Economy Gage Block Set, 81 Piece

Durable Construction: This block set is made of the finest grade of high carbon / chrome steel that has a low coefficient of thermal expansion; fully stress relieved and hardened to 65 RC Accuracy: The gage block set is lapped and polished to a very low micro surface finish; they feature a 0.00005" accuracy 81 Piece Set: These gage blocks come with 9 blocks 0.1001 thru 0.1009 , steps of 0.0001 ; 49 blocks 0.101 thru 0.149 , steps of 0.001 ; 19 blocks 0.050 thru 0.950 , steps of 0.050 ; and 4 blocks 1.000 thru 4.000 , steps of 1.000 Set Includes: The set of gage blocks includes a deluxe fitted case and certificate of inspection traceable to the National Institute of Standards & Technology