– Diameter: 3mm to 25.4mm

– Material: SUJ2 (GCr15)

– Gloss, roundness of surface as degree of accuracy: degree of accuracy G10 – Roundness 0.02, degree of accuracy G16 – Roundness 0.025 degree of accuracy G20 –Roundness 0.032

– Hardness (HRC): 62 to 67