BIGBearing: The Pulley Bearing Takes a lot of abuse and is often the first thing to fail. We use a Larger Pulley Bearing for a much longer life. We designed our Billet Pulley with a snapring making the bearing replaceable. High Torque Coil: This OEM Upgrade is 120ftlbs of Torque (OEM Torque is 95 ftlbs). Higher Torque Means this Clutch holds Strong Even in the Toughest Cuts. Tough Billet Pulleys: Billet Pulleys Reduce Belt Wear and Maintain Perfect Blade Speed. Our Billet Pulley Design uses a Snap Ring and Allows for Bearing Replacement. Fits: 2690971-02, 2691048-03, 2691048-04, 2691138-00, 2691139-00, 2691140-00, 2691158-00, 2691140-01, 2691160-00, 2691161-00, 2691162-00, 2691163-00, 2691168-00, 2691169-00, 2691170-00, 2691193-00, 2691266-00, 2691266-01, 2691266-02, 2691266-03, 2691279-00, 2691299-00, 2691300-00, 2691302-00, 2691306-00, 2691307-00, 2691308-00, 2691309-00, 2691334-00, 2691334-02, 2691334-01, 2691334-03, 2691335-00, 2691335-01, 2691335-03, 2691336-00, 2691336-01, 2691336-02, 2691364-00, Fits: 2691369-00, 2691467-00, 2691670-00, 2691670-01, 2691671-00, 2691671-01, 7800768, 7800768, 7800768-01, 7800768-01, 7800796, ETZ20420, MF2600 HD Clutch es are designed at HD Clutch and Assembled in the USA. Higher Torque: 110 ft-lbs (OEM is 95 ft-lbs). We add a few more windings to our coils to provide the maximum gripping strength to prevent damaging micro-slipping during tough cutting conditions. The HD Switch BIGBearing design addresses the #1 reason Clutch es fail with a larger tougher pulley bearing. Machined Billet Pulleys: It is easy to damage formed pulley and damage (even a small stone nick) damages the belt with every rotation. With our Billet Pulley design, we include a snap ring so the bearing is replaceable, making this Clutch rebuildable. Clutch es all run very hot; we use a composite material instead of plastic to allow the heat to dissipate much faster. This makes the HD Clutch run much cooler; extending the bearing and Clutch life. HD Clutch wrote the Bearing specifications to include Premium C3 Rated Bearings and high temperature rated synthetic grease to combat heat. Less Heat = Extended Life.