Tighten jacks and save your gig without taking anything apart! This handy tool tightens jacks on guitars, amps, and pedals. It works from the outside to prevent twisting and breaking the delicate solder joints inside the jack. Simple and inexpensive, it's a pocket-sized fix for a very common problem. Put one in your gig bag, jacks always fail when you least expect it! - Smooth molded plastic, so it won't scratch your guitar or amp hardware. - Original Bullet: fits 1/2 inch nuts for 1/4 inch jacks Fix your jack in three easy steps: - Put the socket head over the 1/2 nut - Press the rubbery Grip-Tip™ into the jack to hold it - Turn the tightening handle. That’s it!