... thickness, gauge clearance angle, face design and button insert types.Thread button bitsDescription:suitable for powerful percussive drills and top hammers ... for Indian quarry and Norway, Finland quarry.Tapered button drill bit specifications :Type: button bitsShank Hex.Size: 19mm,22mm,25mmDiameter: 30 ... COP32 34 44 54 64 84, Ingersoll-Rand ‘s DHD3.5,DHD3.5HD,DHD 340A , DHD350R, DHD 360, DHD380 QL40, ...