Barnetts 3 in belt drives are designed for appearance and function These belt drives utilize the Scorpion lock-up clutch assembly for the ultimate street or strip performance The Scorpion lock-up clutch allows the use of lighter coil springs by using adjustable pressure arms that progressively increase clutch spring pressure as RPMs increase CNC machined from 6061-T6 billet aluminum 100 percent increase in clutch capacity Lighter lever pull Suitable for street or strip-stock to high performance motors Available in polished finish Front Pulley Bearing Support This product can be used with Model Part# Harley-Davidson Softail 90-Up SBDHD-1 Harley-Davidson Softail 90-Up SBDHD-2