77pc. set includes mix of Ellstrom Dearborn brand and Pratt & Whitneybrand blocks the 1.0 block has been replaced with 1.0 diameter precision ground T1 tool steel gage. this was originally 81pc set it is missing the following block sizes .1001, .1002, .1005 and .150 excelent for sine plate stacks or CNC cutter pick up.
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