This kit allows you to build your own finger brake. We make it easy by cutting out all the pieces necessary to build it with very simple tools. We source the difficult to find pieces of metal and hardware like springs or Dom tubing that make this kit possible. I believe this is the least expensive way to have this capability in your shop! Check out our video on how it all goes together. Step by step here 
https://youtu.be/0nTWD_j6dkg
You will need 
36"    3"HR FB 
36"     3"x5" 3/8" Angle
40".    4"x6" 3/8"  Angle 
40".    4" x 1/2" FB (preferably cold rolled)