A pair of lower hooks for three-point coupling, each comprising hook (12a, 12b) a body (15) with an elbow portion (16) protruding from a box part (17) inside which are housed a drive mechanisms for a closure means (19), defining the box portion (17) with one wall a first side (14a, 14b) and at least partially closed by a closure plate (18) defining at least partly a second side (13a, 13b), characterized in that the two hooks (12a, 12b) are substantially mirror images of each other with respect to the box portion (17) and the closure plate (18).
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