... hand 4.Material: HSS HSS Gear Hobs Milling Cutter:1.Gear hobs,spline hobs,standard gear hobs,sprocket hobs,worm gear hobs, serration hobs,timing ... pulley hobs 2.DIN/BS/JIS/GB Gear hobs,spline hobs,standard gear hobs,sprocket hobs,worm gear hobs, serration hobs,timing pulley hobs ...