Ingersoll Rand 1211MAX-D3 1211MAX Series High Speed Air Impact Ratchet Wrench, 3/8" Drive, 625 RPM, 80 ft-lb Nut Busting Torque. Series: 1211MAX Series. The Ingersoll Rand 1211MAX-D3 air impact ratchet wrench can also be referred to as 3/8" high speed air ratchet, air impact ratchet wrench, 625 RPM pneumatic ratchet, 1211MAX Series ratchet, and reactionless impact ratchet.