I.nternational standard Timing Belt Pulley 2.Most competitive on European market 3.3M to ... option:aluminium alloy,steel,stainless steel,iron,plastic,nylon,etcMax width of the pulley :520mm.Surface treatment:High frequency,black of ... ,gear shaper,hobbing machine,grinder,testing center Aluminum Pulley: Pulley with flange(Black of oxidation):Pulley (Black of oxidation):Nylon Pulley: Steel Timing Belt ...