Abstract: A vibrating float for prefinishing concrete. The float includes a float member with a planar surface, an elongated handle for manipulating the float member over the concrete with its planar surface in contact with the surface of the concrete, and a pair of pneumatically driven vibrators. The vibrators are mounted on the upper surface of the float member on either side of the centrally attached handle and can be adjusted easily and quickly to vary the vibrational pattern of the float member for the most efficient and effective working of the particular concrete mix. Each vibrator has an exterior housing member with a rotatable mounted collar member within it. The collar member is cylindrical and end pieces are provided to confine a ball member within the collar member. The housing member has an air hole through it and the collar member has at least two air holes in it of different sizes.