I bought two of these to use with my Wen 12" drill. They hold workpieces securely and are easy to use, but they are too large for practical use. They are so long that they must be fully extended to the ends of the guides in order for the clamping point to keep the parts within reach of the chuck. They also block access to parts after installation and make it difficult to apply vacuum to the drill to collect metal shavings. Also note that when pinching painted parts, the pinch point will be printed on the paint, so use pieces of wood or rubber as a pad.