Profile: T W International Ltd. is a retailer of engineering tools and soldering products. We sell pliers, side cutters, snipe nose pliers, flat nose pliers, water pump pliers, hand operated, de-soldering and pump solder. Our product line includes flux, basic electric soldering techniques, de-soldering & re-soldering, and stained glass soldering. All solder pads and device terminals must be clean for good wetting and heat transfer. The soldering iron or gun must be clean and pre- tinned with solder, otherwise components may heat up excessively due to poor heat transfer. The devices must then be mounted on the circuit board properly.