Feuling Race Series Oversized Diameter (0.8435 .in - 0.844 .in) Hydraulic Lifte - One Size Full travel hydraulic lifters are machined from a steel body and designed to exceed the need of large lift camshafts and higher valve spring pressures with a slower bleed down rate Race Series lifters maintain proper oil flow to the top end, increase engine RPM, valve-train stability, decreasing valve float promoting maximum valve lift Available in oversized diameters Made in the USA Fits 99-13 Twin Cam; 00-13 Sportster, Buell