This grease scraped stencil is used to refit and upgrade the heat sink of the S19J hash board. Before assembling the upgraded heat sink, we need to smooth the surface of the ASIC chip so that the thermal grease can better cover it. At the same time, this tool covers the S19J hash board and not the ASIC chip. This allows the thermal grease to be applied evenly without damaging other small electronic components. Use this tool to increase the success rate of installing and upgrading heat sinks, accurate positioning, lower maintenance costs, and better grease coverage. It is one of the most commonly used spare parts for refitting radiators.