This is a AL-KO Style towball with mounting bolts and is compatible with the ALKO stabilisers including the AKS 3004, AKS 2007, AKS 2004 and AKS 1300 caravan stabiliser hitches and can also be used with Winterhoff stabilisers. It has the extended high reach neck to allow for correct clearance and stabiliser articulation. Has standard 90mm fixing holes to take 16mm 8.8 high tensile bolts. Has standard 50mm towball so standard trailer and caravan hitches will fit as well as towball mounted cycle carriers.