7/16 x 20UNF draw bolt thread
Tungsten Molybdenum grade high speed steel
Sapphire Aqua 2 has good resistance to oxidation
The scales are photo etched into a glass reticle which is placed in contact with the measure object thus obtaining simultaneous enlarged images of the scale & measured object
Rotacut Metric Sheet Metal Cutter Kit 1437230 7/16 x 20UNF draw boltRotaCut's are far superior to twist drills and hole saws. They cut 3x faster and last 10x longer, plus there's no comparison in quality. Use with hand held drills or drill presses with a 3 8" or 1 2" chuck for holes in sheet metal, plate materials, and plastics up to 1 4" thick. Ideal for: Electrical, Piping, Conduit Work, Sheetmetal Fabrication, Spotweld Removal, Maintenance Installations, HVAC, PHCC, Automotive Aftermarket and many others Plastic