A.0.55~O.7mm B.0.61~0.8mm C.0.67~0.9mm D.0.67~O.9mm
A.120~150℃ B.140~170℃ C.160~190℃ D.190~210℃
A.≥53HRC B.≥55HRC C.≥57HRC D.≥59HRC