TISCO - a division of Teyseer. Its in industrial area. They have a huge number of safety and work accesories. Definitely pay them a visit and they can help you out. The staff there is very resposive and helpful. They know what they sell and its good.

Nuts & Bolts - this is the second shop I would recommend. It is also in the industrial area. They too are a good shop for these items.

Good luck!