Drilling holes in walls in an HDB flat?

Question

Hi. I live in an HDB flat and am trying to drill holes in a wall to ifix some shelves. I barely drill 0.5cm and i come across some what I believe is some iron or metal in the conrete and i am unable to drill further. A using a black and decker with a silver drill bit ideal for concrete. Has anyone come across this problem? Also does anyone know any person who would come and help out (like a handyman) at a cost of course. Hope this helps. Thanks. Chris

Answer 1

what is HDB?
high density brick?
reed bar 5 mm below the surface?

Answer 2

You may have hit some reinforcement bar (Steel). Either move over an inch or two or get a metal drill bit.