Armour of Mettle

From LSWiki

This is a bracer made of steel.  The quality of its craftsmanship is excellent.  It bears three runes in a triangular arrangement. You  recognize it as a bracer of mettle, enchanted to diminish the wearer's sensation of pain.  You are wearing it.
   It is in perfect condition.
   It is intermediate in size, and looks just about right to fit you.  It appears to you as if it was crafted for a human.  It looks  about one dimin across, three and nineteen twentieths dimins long, and a twentieth of a dimin thick.  It weighs about two and three  tenths dekans.