Perfect size:
15mm(19/32"), 16mm(5/8"), 17mm(43/64"), 18mm(45/64"), 19mm(3/4"), 20mm(25/32") , 21mm(25/32"), 22mm(55/64"), 23mm(29/32"), 24mm(15/16"), 25mm(1"), 26mm(1-1 / 42"), 28mm (1-1 / 10"), 30mm(1-3 / 16"), 32mm(1-1 / 4"), 35mm(1-3 / 8"), 38mm(1.49")