Diamond grinding cups manufacturer & supplier, from liaocheng jinquan construction machinery co., ltd, china. Available with a choice of hemispherical, ballistic semi ballistic, paraboloid or conical pins, in sizes 6mm to 25mm. Other sizes are available on request. Atlas button bits diamond grinding pins: - specially formulated matrix for maximum performance - maintain proper profile time and time again - strategically positioned flushing outlets for improved flushing and cooling - maximize drilling economy - field proven Normal models: Diaroc/king pin (shank=8mm); Diamond grinding pin (shank=9mm); Pin-atlas model pin; Internal hex model pin.