The 6637 Strut Tamer II Extreme sets a new standard in strength and safety for strut spring compressors. This unit meets the new ASME PASE safety standards for spring compressors and is capable of safely compressing the largest strut springs. A replacement for the Strut Tamer Extreme with improvements designed to provide quick and safe strut service for technicians. The 6637-ST includes the Strut Tamer II Extreme and stand with wheels to move around the shop and save space. Spring capacity is 2 1/2" to 10" Diameter, 1 1/4" to 24" Vertical Stroke; and the gear reduction is 2:1 torque compression.