2-parts kit made of Polystyrene for the realization of a slewing ring/turntable for semi-trailers in the scale 1:24/25. The components of this slewing ring/turntable are already prepared/built so that the two parts only need to be plugged into each other and thus result in a functioning slewing ring/turntable. The slewing ring/turntable with 46mm outer diameter can be used for scratch-built semi-trailer projects in the scale 1:24/25.