be inserted in the area of their working surface the fronts of the components 1 2 rest solidly against each other and form a gap 16 on the side facing the base this gap shown in the figure is not necessary but is only provided when needed the components which will ideally consist of wood a wood product or plastic can be provided with coatings 23 24 is order to have the appropriate surface qualities or appearance mutually fitting locking elements 7 8 are provided on the tongue 6 or the wedge shaped areas 11 of the tongue and in the groove 5 or the lateral areas 9 of the groove these locking elements 7 8 can be projections and or recesses which interact or interlock with each other the cross sections of the recesses and corresponding projections 7 8 correspond such that they rest against each other when the components 1 2 are combined the locking elements 7 8 are engaged with each other the locking elements 7 8 are formed over the entire length of the longitudinal and or narrow sides of the components 1 2 as shown in fig3 on at least one tongue wedge area 11 a projection 7 is formed which is received by the recess 8.