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Upper part of housing with socket, for plug-in modules for NTL student experiments;Extremely robust yellow ABS housing, very smooth surface for marking the circuit symbol or other labelling with an appropriate pen, with socket for holding cables or other components with 4 mm lamellar plugsDimensions: 40 x 40 x 27 mmMass: approx. 15 gadditionally required: P6300-1D PIB - bottom with 2 pins straightDE929-3T Phillips screws, set of 40orP6300-2D PIB - bottom with 2 pins angledorP6300-3D PIB - bottom with 3 pinsor P6300-4D PIB - bottom with 4 pins