588A1 - 2 1/2" Super Duty Impact The 2 1/2” square driver found on the 588A1 provides for fast removal and tightening of large (4” [102 mm] and larger) fasteners. 599A1 - 3 1/2" Super Duty Impact Simply put, the 599A1 is the most powerful Impactool in the world. Normally the 599A1 operates from 26,000-42,000 lb.-ft. of torque but can be adjusted to produce 80,000 lb.-ft. 5982A1- 2 1/2" Super Duty Impact The IR 5982A1 Super Duty Impactool delivers 850 impacts per minute and has a recommended torque range from 4000-10000 lb.-ft. It comes standard with lever throttle, 3/4" NPT inlet, and aluminum hammer case.