LM Products Sure Lock Straps Blue

 Brilliantly simple, simply effective
I've been using the Sure-Lock strap for years. It uses a keyhole-shaped hole for the strap button, with a snap fastened cover, to securely attach the strap to the guitar. You can move it from instrument to instrument instantly. It requires no modification to the guitar - no special strap button like the Dunlop system. It's very inexpensive and very secure. LM also makes a conversion kit so you can add their locking ends to your existing guitar strap. There's no feeling like watching your expensive guitar plummeting to the floor in the middle of your big song, but if you're using a locking strap you'll never have to know that feeling. This is my favorite of the locking systems.