This is a steel adapter , not a flimzy aluminum tool, which allows you to replace the hand crank on your bridgeport or import clone. Lift that knee up and down. By using a battery powered drill motor with a 1/2 inch chuck.. This is a great shoulder saver for us older machinists. This will fit all mills with a. Shaft and a 9 cog interface. You can also use any 1 wrench as a lever source. This tool will work on. Bridgeports, comets, enco, supermax, victor, jet, alliant, acer, sharp, chevalier, and webb with a 9 cog interface. Here is a video of this tool in action using a $69.00 robie drill from home base. My mill table has a 100 pound vise and a 150 pound turn table on it!The item “Bridgeport and Import Milling Machine power knee lift tool easy on the back” is in sale since Wednesday, February 20, 2013. This item is in the category “Business & Industrial\Manufacturing & Metalworking\Metalworking Tooling\Equipment Specific Tooling\Milling”. The seller is “cathiesmachine” and is located in Redding, California. This item can be shipped worldwide.