Authentic Simple Woodturning Tools - Pack of 3 Replacement Cutters for Mid Size 3 Tool Set (fits tools engraved with MSTH, MSR & MS55D) Contains 3 carbide replacement cutters: 1 each for tools engraved with MSTH, MSR and MS55D. Fits mid size Simple Woodturning Tools only. " round carbide cutter fits Mid Size Simple Turner and Hollower (engraved MSTH) 55 diamond carbide cutter fits Mid Size Simple 55 Detailer (engraved MS55D) 10.5mm 90 square carbide cutter fits Mid Size Simple Rougher (engraved MSR)