1) Material and construction Tension spring is made of stainless steel, providing flexible yet durable performance. The holder is made from thick stainless steel that protects against heat, suitable for repeated use during heatrelated tasks. 2) Compatibility and purpose Designed to work with a variety of mobile phones, tablets, and electronic PCB boards. Ideal for clamping mobile phone PCBs, during soldering, desoldering, or rework. 3) Easy to use Width adjustable with two movable positioning blocks. Position the motherboard to the desired location, then tighten the screw to hold the board securely in place. 4) Size and application PCB holder size: 12 cm x 8 cm (4.72 in x 3.15 in). A practical tool for clamping circuit boards for soldering, desoldering, or rework. Use scenarios Secure a smartphone motherboard on the holder during BGA rework or finepitch soldering to keep the board stable. Clamp a tablet or other electronic PCB while performing soldering or desoldering work to prevent movement. Hold circuit boards steady during testing or routine rework projects on a workstation.