AVOID this brand! Some of the tips are good, most suck. The tips I used of dismantling my PSP literally crumbled away, untill finally breaking. Whats worse is that the bits of the tips that broke off got magnetically charged and stuck INSIDE the screw heads. I ultimately had to take it to a repair shop to have it reassembled.
Why be cheap on something like this? Buy a good set and it'll last you years.