needed more springs for one of my trems so went with the full kit so i would have spare springs and screws if ever needed, tougher than mr slinky, these are the quality you expect from fender, the claw was actually better quality than the one installed on my guitar so i swapped that out also, now i can do all the springy wobbly stuff you can do on a tremolo knowing they are attached to my guitar with fender quality, if you need a claw stronger than a lion, springs more bouncy than a trampoline and screws with more threads than an intel processor, this might just be the kit for you