Yes, the Klein Tools model # 31905 Hole Saw Arbor with Adapter is suitable for drilling through metal. It is designed for use with all Klein Tools Bi-Metal Hole Saws.
HOLE SAW IS THREADED...... SHOULDN'T COME LOOSE UNLESS YOU HAVE "JAMMED" IT AND USED REVERSE ON YOUR DRILL. IF YOUR HOLE SAW DOESN'T FIT UNTO THE THREADS YOU MAY NEED THE VARIETY THAT HAS 2 "PINS" THAT FIT INTO THE HOLE SAW. THIS BIT IS FOR USE WITH UP 1 1/8" BITS, WITH THE EXTRA FITTING THREADED ON IT WILL WORK EXCELLENTLY WITH 1 3/8" BITS. LARGER YOU NEED THE "PINNED" VARIETY.