SLP 40-66 DRIVE SPRING

SLP 40-66 DRIVE SPRING. The vendor part number is 40-66. Read title to know what you are getting. Catalog descrition… SLP'sline of drive springs allows you to choose a spring that not only gives you the engagement that you desire, but also delivers proper peak RPM. For higher engagement, increase the 2.50" compression rate. For lower engagement, decrease it. For higher peak RPM, increase the 1.25" compression rate. For lower peak RPM, decrease it. Manufactured using only the Highest Quality Chrome-Silicone wire that has been shot peened to make a very durable spring that is resistant to sag and breakage