Starrett RS 81.A
Rectangular Steel Grade Set in Case 81 pieces, Grade O includes Commercial Calibration and etched serial numbers.
81-Piece Rectangular Steel Gage Block Set with case.
Fred Fowler 53-670-038
36-Piece Gage O Rectangular Steel Gage Block Set with case
Starrett RS 81.B
81- Piece Gage Block Sets are a Starrett Global product that combines a tolerance of ±µ inches with a very affordable price.