Safety chucks are used for supporting a product reel which requires unwinding or rewinding. The shaft through the reel would have square ends which locate into the square jaw of the chuck.
Sisc Brake type ALA, H 1, unmounted, disc brake, alanco Alamatic
The Model LKT clutch or brake contains identical features to the Model LK units with the exception being the cylinder piston arrangement. Whereas the Model LK unit has a full cylinder covering