Allied Machine & Engineering Corp. offers the T-A® Diamond Film coated drill inserts with all the benefits of the replaceable-tip tooling. End-users report an extended life of 10%-30% over competitive tooling. This is because Allied's Diamond coated T-A® offers increased durability and a more effective coating. Available as non-stocked standard in the diameter range of 3/8" thru 1- 7/8" (9,5 mm - 47mm).