Do you have instruction on how the attach the DWASHRIR to an impact driver? Support November 17, 2020 13:49 Updated Follow To attach the DWASHRIR to a 1/4 hex impact driver please see below: Related articles What model impact drivers will the DWASHRIR work with? Can I use my impact driver as a drill? Where can I start an online warranty repair claim? Fastening torque for the DEWALT® DCF894 is listed at 330 ft lbs, what is the breakaway torque? What is the maximum size socket that can be used on our impact wrenches? Comments 0 comments Please sign in to leave a comment.