What are jack chains? That looks like some kind of wierd, mutated, horsehoe-crab insectiod-reptiloid thing!
Here's a hint - (shown with arming jack and Milanese gauntlets):
Jack chains were an important part of the protective equipment of the fifteenth century infantry soldier who, typically, was not dressed in plate armor but wore a padded arming jacket (“jack”) to protect his upper body. The arming jack was quite effective in protecting the torso but left the arms vulnerable to slashing sword cuts. A severe dislike of slashing sword cuts led to the development of “jack chains”, which were simply multi-jointed steel strips sewn to the outside of the sleeves of the jacket, and which often incorporated an elbow piece to cover the outside of the elbow. Modern studies have indicated that jack chains prevented up to 80% of slashing sword cut arm injuries. These 14 gauge steel jack chains are an excellent companion for the deluxe arming jack, the arming jack - white or the arming jack - black. Made by GDFB - Get Dressed For Battle.
length: 31 1/2"
splints: 5 3/4" each
rings: 1 1/2" outer diameter
cops: 8" (wings) x 11 1/2" (around curve point to point)
weight: 1 lb 15.5 oz each
Discontinued and sold out