25 Pieces DIN 562 M3 Square Nut M3nS Fits Prusa 3D Printers $7.95 Brand Unbranded Type Square Nuts System of Measurement Metric Material Steel Thread Size M3 condition New DIN 562 M3 Square Nuts - 25 piecesPrusa part # M3nSManufactured to DIN 562: 5.5mm length x 5.5mm width x 1.8mm thick with a 0.5mm pitch