Hand Soldering System, Convection Rework, Fume Extraction System, Fluid Dispensing System Hand Soldering System, Convection Rework, Fume Extraction Sytem, Fluid Dispensing System Official OKInternational site. OK International is a global manufacturer of bench tools, equipment and related products that are used in the electronics and industrial product assembly. Include brands: Metcal, Techcon, Quant 3D, and ProWorks.