The disclosure concerns a device for fastening a handle, arm rest, or the like, to a wall in a vehicle, or the like. Two receptacles for pins are provided at spaced apart holes in the wall. A guide pin on the part is shaped so that once the guide pin is inserted in the wall, and the part is moved against the wall, the pin extends generally parallel to the wall. A locking pin is located at another location on the part and it extends straight into the wall. A pull out safety comprising two spring legs biased together against the pin prevent extraction of the locking pin. A third, retaining pin may be provided spaced from the other two pins and parallel to the locking pin for being received in yet another hole in the wall. The pull out safety is part of a clamp for the locking pin. The clamp is U-shaped and the legs of clamp hold the locking pin. The web of the clamp has a hole in it for permitting the locking pin to be shifted laterally of its length for unclamping and clamping the locking pin. The part itself has a reinforcing insert for stiffening it and the various pins may be parts of the reinforcing insert.