I tried this item with no prior reviews and it worked great. Each of the 60 bits measures +0.000 to -0.001 inches, nice sharp grooves and clear laser engraved marks. The metal body is very compact and each nozzle is marked with inch diameter, wire gauge number and corresponding tap size where applicable. This set is as premium as the price suggests ($64.13 + Prime as of August 23, 2013).