If you have ever had a timer plate stud (stand off) break off in the gear cover, then you can realize the importance of a high quality pair. These are machined from 17-4 high-strength stainless steel and are undeniably the very best available. Go ahead and look up 17-4 stainless steel if you're not sure about its material properties. .760" unthreaded section of stand-off length Fits 1970-1999 Harley Shovelhead/EVO Big Twin & 1971-2003 Sportster Ironhead/Evolution Replaces HD# 32601-78 SOLD AS A PAIR