This is an adjustable 4-40 ball link set with hardware. Adjustable as in you can adjust the tension on the ball.
Features: Steel, brass, & plastic construction
Requires: 1/4 wrench for the lock nuts, 3/32 allend wrench for the socket head cap screws and a small flat head screw driver for the small silver screws
Note: The ball link has a 1/4 hex to make it easier to install with a 1/4 open end wrench.