The Fowler 53-672-081 Shop-Blox Economy Rectangular Gage Block Set has the following specifications:
Blocks Per Set: 81
Tolerances: +/- .00005"
Certification of Inspection traceable to NIST
+/-.000050" accuracy for a lower price, each department can now have their own set.
Standard industrial sizes ensure complete interchangeability with all accessories.
Each set complete with deluxe fitted case and Certificate of Inspection traceable to
the National Institute of Standards & Technology.
The 53-672-081 set includes:
9 Blocks .1001" thru .1009" step of .0001"
49 Blocks .101" thru .149" step of .001"
19 Blocks .050" thru .950" step of .050"
4 Blocks 1.000" thru 4.000" step of 1.000"
The economy gage block sets are identical to our standard sets in all
respects, except for the wider range of tolerance which is more than adequate for a majority
of shop needs. Blocks are rectangular, constructed of the finest grade of high carbon/chrome
steel, fully stress relieved, hardened to 65 RC, lapped and mirror polished to a very low micro-surface finish. Blocks feature a low coefficient of thermal expansion, and they are carefully
inspected for accurate size. parallelism and flatness.