Machine Outer� Bore� Thickness Teeth 80/ 90 12" / 305mm 2-7/ 16" / 61.9mm 0.037" / 0.94mm 282 120 12" / 305mm 3-15/ 16" / 100mm 0.037" / 0.94mm 282 119/ 114 16" / 406mm 6-7/ 8" / 174mm 0.037" / 0.94mm 352 164/ 198 12" / 305mm 4-3/ 4" / 120mm 0.045" / 1.15mm 282 80/ 88/ 90 12" / 305mm 2-7/ 16" / 61.9mm 0.036" / 0.92mm 282/ 264 128/ 158 12" / 305mm 3-7/ 16" / 87.5mm 0.036" / 0.92mm 282/ 264 158 12" / 305mm 4-3/ 4" / 120mm 0.036" / 0.92mm 282 80-18/ 90-18 18" / 457.2mm 3-7/ 16" / 87.5mm 0.045" / 1.15mm 396 120-18/ 142-18 18" / 457.2mm 7-15/ 16" / 201.61mm 0.045" / 1.15mm 396 100-120 12" / 305mm 2-7/ 16" / 61.9mm 0.038" / 0.96mm 282 177-178 Dual 12" / 305mm 2-7/ 16" / 61.9mm 0.038" / 0.96mm 282 224-254 Dual 12" / 305mm 2-7/ 16" / 61.9mm 0.038" / 0.96mm 282 177-178 Dual 11-1/ 4" / 286mm 2-7/ 16" / 61.9mm 0.038" / 0.96mm 245 224-252 Dual 11-1/ 4" / 286mm 3-7/ 16" / 87.5mm 0.038" / 0.96mm 245