An "ON THE CAR" Tool. Makes compressing the spring and removing the keepers a simple job because there is no need to remove the head. Adjustable cam action. Fast, because there is no need to readjust the tool after each spring. 16910- Bolt (1/2-13) 2" long *used on 1 1/4 in to 2 1/4 in spring sizes-dbl springs if inside spring is a dampener spring. *will not work on Chevy 2.2 Eco tech engines nor triple spring *the bolt is used in tight access areas, remove handle and insert bolt *If it has an overhead cam it will not work. If it doesn't it will work on Dodges