... joint is GAS 1/2″.Main types of finger bits we produce: sintered finger bit with continuum rim ... (with holes), sintered segmented finger bits with bearingφ20X25,φ20X25φ20X35,φ20X40,φ20X45,φ20X50,φ20X60,φ ... , 20x40mm, 20x50mm Diamond Finger Bit,CNC Finger Bit,Stone Tool,Diamond Granite & Marble Core Bit ,Fast Cutting(350-470 ... bitjinshan finger bitstone finger bit Diamond Finger Bits