Grizzly H5939 Boring Head 18 pc. R-8 Set New

The Grizzly H5939 Boring Head 18-piece R-8 set is a milling machine boring and facing tool package designed for accurate hole enlargement and internal machining. It includes a 2-inch boring head with 7/8"-20 mounting threads, an R-8 shank, and a fitted case for organized storage.

This set comes with nine carbide-tipped boring bars with 1/2-inch shanks and two facing tools with 3/16-inch square HSS cutting tools, giving machinists versatility for a range of boring and facing operations. The dial is graduated in .001-inch increments, with .050 inch per revolution and .025 inch actual motion for controlled, precise adjustment.

Ideal for machinists, toolrooms, maintenance shops, and serious hobby users, this set is well suited for R-8 spindle milling machines where dependable boring accuracy and multiple tooling options are needed.