Special for glass thickness 3mm,4mm,5mm and 6mm. There are two kinds of profile diamond grinding wheels: PE profile diamond grinding wheel (Pencil Edge) FA profile diamond grinding wheel (Flat with Arris) Use for the glass shape of pencil edge and flat with arris on single/double straight line round edge machine or shape machine or bevelling machine or arris grinding machine or CNC machine. Adopt in the rotation of 2880r/min. Sharp, few chips, wear resistant, good balance without shaking or vibrating. Configuration: For single/double round edge machine, 2pcs wheels or 3pcs wheels require.(Pos.1 150# + Pos.2 240#) or (Pos.1 120# + Pos.2 180# + Pos.3 240#). For beveling machine, one wheel requests as 180# for bottom edge grinding. For Shape machine or arris grinding machine, one wheel requires as 150# or 180# or 240# if thin glass. Use on CNC machine.