This sharpener is used with Spinnet and Challenge style drill bits. It works with bits from 1/8" to 1/2." It includes one multi-flute reamer. Challenge & Spinnit MS-1 Precision Drill Sharpener This Challenge & Spinnit MS-1 Precision Drill Sharpener is for using with Style A and L hollow drill bits.

This precision sharpener has a self-seating, lathe type construction on a heavy-duty base. It comes with suction feet for stability and portability, but can be removed for mounting purposes and is constructed with a solid carbide cutting head for a long sharpening life