The clutch button sizes 63*57,the Thickness can 3.2mm,3.6mm,4mm,4.8mm.5.5mm 1)We passed ISO 9001.2)It is apply to Komatsu,Caterpillar,Case,JCB.MF,Ford.3)Wet coef.(statical)0.11-0.154)Wet coef.(Dyn)0.04-0.085)Wear Rate:≤1.0 X 10-8 cm3/J Clutch button-FCI 63*57