... : 1) Diameters available: a) 1.1 / 4" (6mm), 2.5 / 16" (8mm), 3.3 / 8" Plastic Binding Comb PLASTIC Binding Ring ... ), 5.1 / 2" (12mm), 6.9 / 16" (14mm)c) 7.5 / 8" (16mm), 8.11 / 16"(18mm), 9.3 / 4" (19mm)d ... ) 10.13 / 16" (20mm), 11.7 / 8"(22mm), 12 ... ), 14.1 - 1/4"(32mm), 15.1 - 3/8" (35mm)f) 16.1 - 1/2" (38mm), 17.1 - 3/4" (45mm), 18 ...