The ST-C353 is an air impact wrench with a twin hammer clutch.  This is a light weight compact unit with a low vibration composite handle and motor housing. The forward/reverse lever is located at the rear of the unit and allows for multiple speeds in forward. To start the wrench the user simply applies a light pressure on trigger. The trigger is designed with a slow start control for speed control. 

Features:

• Trigger start
• Excellent combination of power and ergonomic features
• Twin Hammer impach system
• Low noise, low vibration and high torque
• Reverse/forward switch 
• CE Certified
• Torque adjustable by external dial

Specifications:

• Torque range (ft-lb): 280
• Torque range (N-M): 380
• R.P.M.: 10,000
• Length: 6.5 in (165 mm)
• Air Inlet Thread: ¼ in
• Air House: 3/8
• Weight: 2.64lb (1.2 kg ) 
• Noise Level: 90(+/-2dBA)
• Air Pressure: 90 psi (6.3 kg/cm2)
• Air Consumption: 6CFM (170 l/min)
• Driver: 3/8 
• Bolt Size: 5/8 in (M14)