Sherline 7605B Carbide Insert (Bulk 10) for 55° Holder
This is a 10 pack of replacement carbide inserts for the following part numbers:
P/N 2262 Straight Insert Tool Holder
P/N 2256 55° RH Carbide Tool Holder
P/N 2257 55° LH Carbide Tool Holder
P/N 2258 Set of both 55° RH and LH holders
Though not inexpensive, when you consider you are getting four cutting tools in one and are saving a lot of time in tool sharpening, it is really a pretty good deal.
Carbide cutters give good finishes on hard-to-machine materials such as cold rolled steel. They will also work on aluminum, brass or leaded steels, and will last practically forever, however, the best finishes on those materials are still achieved with a good, sharp high-speed steel tool.