We offer a couple of different types and sizes of these devices and find that when you need to mix a little more than just a small cupful of material they are invaluable. They work best on a 1/4" or 3/8" variable speed drill. For long lasting value the American made, heavy duty variety work best. If you need something for a short run, the economy grade will do. Small size good for up to a quart of liquid. Dimensions: Shaft = .25" Length with Head: 9" Length without head: 7.5" Head Diameter: 1.25"