mm inch Outer * Bore * Thickness Outer * Bore * Thickness 305* 61.9* 0.92mm 12" * 2-7/ 16" * 0.036" 305* 61.9* 0.94mm 12" * 2-7/ 16" * 0.037" 305* 61.9* 0.96mm 12" * 2-7/ 16" * 0.038" 305* 61.9* 1.15mm 12" * 2-7/ 16" * 0.045" 305* 87.5* 0.92mm 12" * 3-7/ 16" * 0.036" 305* 87.5* 0.96mm 12" * 3-7/ 16" * 0.038" 305* 87.5* 1.15mm 12" * 3-7/ 16" * 0.045" 305* 120* 0.92mm 12" * 4-3/ 4" * 0.036" 305* 120* 1.15mm 12" * 4-3/ 4" * 0.045" 2.Tooth number 282/ 264 3.Use for Cotton Machinery Lummus 80 88 90 Lummus 128 158 Lummus 108 158