I thought they came in a pack of 5 because they are junk but it was the only long 2.5mm drill bit I could find so I got it risked and ordered it anyway. I've had to drill multiple holes in 6061 aluminum with a cordless drill and never used a single bit. The beat worked so well that I didn't even bother switching to short beats unless I had to reach that far. They even bend without breaking. Completely satisfied! Book them without reservation.