Oh my god, why didn't I get these sooner? I have a 3040 CNC and have tried a few homemade "quick" clamping methods to make clamping easier. I really didn't want to spend money on good ones because I thought I could make good ones for cheap. I've had the opportunity to try some of these clamps and I have to say they are heavenly. They make pocketing things so quick and easy that I wish I had had them sooner, even at the retail price. You're worth it. The speed and convenience of moving them and then clamping them quickly make them a must-have for your CNC. Highly recommended!