Abstract: A tool holder assembly, comprising, a first part (30) which is configured such that it is attachable to a mobile vehicle (50); and a second part (31) which is configured to cooperate with a tool (6); wherein the first and second parts (30,31) each comprises, a first flexible arm (8,10) and a second flexible arm (9,11) and one or more slots (14,15); wherein the first and second parts (30,31) are configured such that they can be arranged so that at least a portion (16,17,18,19) of the first and second flexible arms (8,9,10,11) of the each of the first and second parts (30,31) may be simultaneously received into the one or more slots (14,15) of the other part (30,31); and such that when the portion (16,17,18,19) of the first and second flexible arms (8,9,10,11) of the each of the first and second parts (30,31) are simultaneously received into the one or more slots (14,15) of the other part (30,31), the first and second flexible arms (8,9,10,11) of each part (30,31) are in a flexed position so that an elastic for