... graduation:0.001,0.0005,0.01mm 2.Dia of boring:3/8"-5",1/2"-9" etc 3.Max offset ... :5/8",1",1-5/8" etc F1 type boring heads1.Min graduation:0.001,0.0005,0.01mm2.Dia ... of boring:3/8"-5",1/2"-9" etc3.Max offset:5 ... /8",1",1-5/8" etcmodel no.DHMax offsetBoring bar DiaMin graduationDia of boringF1-1/250 61.6 5/8 ... 93.2 41mm 25mm 0.01mm 15-320mm F1 type boring heads