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Makeblock Copper Washer (4* 10 * 1mm) has an inner diameter of 4mm, outer diameter of 10mm and a thickness of 1mm. Copper washer is brass-material-made and has features of high precision, smoothness, good wear resistance and rust resistance. It can be used in all DIY projects. In Makeblock Plastic Timing Pulley 62T, Plastic Timing Pulley 90T, Plastic Timing Pulley 62T without Steps, and Plastic Timing Pulley 90T without Steps, Makeblock Copper Washer can be used as a high-precision moving part to ensure a stable motion of the above items. Also, it can be used together with the flange copper sleeve (4 * 8 * 3mm)
