Dewalt DCF921 18v Brushless 1/2 Compact impact wrench has upto 609 breakaway torque (406 Nm of fastening torque) ensures removal of the tightest bolts. Its Ultra compact, light weight design allows for use in confined areas while using its square drive with hog ring allows quick socket changes Hole in anvil allows securing of sockets with a retaining pin/rubber O-ring. Ideal for scaffolders. Variable trigger allows complete control over all applications. Efficient brushless motor delivers high performance, extends tool life and allows for much shorter design (only 125mm) Bright white LED with delay feature for improved visibility and functionality. Now with brightness control so you can dim or turn off the light to suit the environment Comfortable rubber XR grip and switch for greater application comfort and maximum control. (DCF921 is recommended for scaffolding) Scaffolding Mode Scaffolding Mode: Helps to prevent overtightening in forward and fastener run-off in reverse. Forward : Tool impacts for 1.5 seconds after run-down to help prevent over tightening. Reverse : Tool stops when fastener is loose to help prevent run-off. Tactile 4 Mode Select Feature Allows the user to select different modes and speed settings for ultimate control. Scaffold mode (DCF921 only) helps to prevent overtightening in forward and fastener run-off in reverse. Low Speed Tool operates at a reduced speed in forward to help prevent overtightening of small fasteners. Forward : Tool operates at a reduced speed Reverse : Tool operates at normal speed Precision wrench Helps to prevent overtightening in forward and fastener run-off in reverse. Forward :Tool pauses before impacting to help prevent over tightening. Reverse : Tool lowers speed when fastener is loose to help prevent run-off High Speed Tool operates at a normal speed in forward and reverse. Forward :Tool operates at normal speed. Reverse :Tool operates at normal speed. D2T version is su