Solder Paste Stencils: Solder paste stencils are essential tools for precisely applying solder paste onto the PCB during the SMT assembly process. They enable accurate deposition of solder paste onto the designated solder pads before the placement of electronic components. Solder Mask Stencils: Solder mask stencils play a critical role in the application of solder mask material onto the PCB. The solder mask serves as a protective layer that is applied over the copper traces and pads on the PCB to prevent unintended solder bridging and ensure proper isolation during the soldering process.