Our Challenge 4952 single-flute carbide reamer has a 3/8" shank.
Compatible Sharpeners:
DSHARP Hand-Held Drill Bit Sharpener
A-4950-2 Challenge Paper Drill Sharpener & Chip Remover
CSHARP Challenge Paper Drill Sharpener
LSHARP Lawson Paper Drill Sharpener
NDSHARP Nygren Dahly Paper Drill Sharpener
