Cheap tools can seriously damage your watch/bracelet.
Example: screw-drivers.
Personal experience. Certain watches use 0.4mm size small screwdrivers. I bought a set of no-name-brand "made in China" screwdrivers from the hardware shop. DISASTER! Even though clearly labeled 0.4mm, the screwdrivers were either oversized/undersized BLUNT. They slipped - scratched up the watch and worse still, damaged the screws by slipping out and damaging the screw-head groove.
Wised up, ditched the cheap rubbish screwdrivers - went to Singapore and bought a set of real German/Swiss made professional watch making screwdrivers and tools. Like day and night the difference in quality and use. Screwdrivers etc. fit perfectly into the grooves, no slippage. A professional set of screwdrivers cost me SGD $50 and it was worth it IMHO.
FYI: The places in Singapore that I know that sells high quality tools:
The watch shop 2nd or 3rd floor Funan Square.
Google JWW, 2nd floor - International Plaza, next to Tanjung Pagar MRT.