This tool kit is back with a lower price.
From link:
Metal drill bits with titanium nitride coating
Titaniumnitride coating excel through their long service life and high strength
For fast, clean drilling in the most diverse metals, plexiglass and hard plastics
Up to 40 percent faster drilling progress than with comparable drill bits
Carbide tip suitable for hammer drilling in masonry, limestone, natural stone and cast stone
No cable ties, no deal