fiber disc wheel, such as brown alumina flap disc; Zirconium alumina flap disc; and Fancy flap disc; flap disc , diamenion as follow:Diameier x hole Max operating speed Max rotation speed Grit Sizes100x16MM : 80m/s 15,300rpm P40-P6004''X5/8''125X22MM 80M/S 12,200rpm P36-P6005''X7/8''150X22MM 80M/S 10.200rpm P36-P6006''X7/8''180X22MM 80M/S 8,500rpm P36-P6007''X7/8'' fiber disc wheel