TMTECK 10 Step UT Block 0.1"-1" 1018 Steel Test Block,Step Wedge Calibration Block for ultrasonic Thickness Gauge with ABS Carrying case and Certificate
Yunnergo Pair of Ultra-Precision 1 x 2 x 3-Inch Parallel Blocks Set 23 Holes 0.0001 Precision with Case&Screws
ABN 123 Block Set Machinist Fabrication Tools - 5 Matched Pairs Steel Precision Gage Blocks with Threaded and Untapped Holes for Milling