China GT60 Threaded Button Bits Retrac
Material: Alloy steel bar 45CrNiMoV and tungsten carbide tips YK05. Body type: Normal body or retrac body. Thread type: R22,R25,R28,R32,R38,T38,T45,T51,ST58,ST68,GT60. Diameter: 32mm-127mm. Button bit shape: spherical and ballistic. Face shape: Flat shape and drop-center shape. Main threaded button bits are: R22-32mm, R22-36mm, R22-38mm, R22-41mm;
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