Ugh, stay away from those little wire salt block hangers. DANGEROUS! I had a horse that liked to bite at his block rather than lick it, and in a short time, he had stripped all the plastic coating off. Within a week, the salt block had eaten through the wire completely and while the salt block was on the floor, the horse now had sharp wire points, right at eye level, sticking out into his stall. You can always just put the block in his feed bucket. Slows them down while they are eating too, if you have one that bolts his feed.
"Keep a leg on each side and your mind in the middle"