Each Simple Woodturning Tool is engraved so you know exactly what tool you have. That makes finding replacement cutters very simple! Look for authentic Simple Woodturning Tool replacement cutters.
Engraving on Full Size Tools:
STH or SSNH = Cutter for STH or SSNH (share the same cutter)
SR = Cutter for SR
S55D = Cutter for S55D
S90D = Cutter for S90D
SSCF (round shaft, not engraved) = Cutter for SSCF
SPT = Replacement blade for SPT
Engraving on Mid Size Tools:
MSTH = Cutter for MSTH
MSR = Cutter for MSR
MS5D = Cutter for MS55D
MS90D = Cutter for MSR or MS90D
MSSCF (round shaft, not engraved) = cutter for MSSCF