Features and Benefits: Extreme duty design to handle the heavier springs found on mid- and some full-size truck strut assemblies New frame includes cross bracing at arm mount locations - standard, this eliminates frame flex when compressing heavier springs 2:1 reduction gearbox - standard, allows for a 2:1 torque compression increase when compressing struts Lock rings to hold arms in position - standard, this eliminates arms from spreading or sliding when compressing offset or unique strut configurations Four-point locking jaws securely hold the spring in place The Strut Tamer Extreme is a very innovative tools that allows for quick and easy service on strut assemblies. This also includes the ability to handle heavy spring applications. Approved by GM for their 1/2-Ton and 3/4-Ton struts, where competitive units are not approved for these applications. Backed by a limited lifetime warranty. Simply the most effective compressor for virtually any straight, conical, or offset spring. Open-ended design means you can take the strut in and out, quickly and easily. The arms adjust in and out, up and down, to accept many sizes of springs. (2-1/2-inch to 10-inch diameter) (2-1/2-inch to 24-inch vertical stroke) Other features include: Extra long 3-bar handle gives user the leverage needed to compress heavier strut springs. No need to change shoes for different size springs. Easy to transport when mounted on stand. Comes with No. 6583 Bridge accessory to be used on springs that cannot be compressed enough to remove the retaining nut.