Abstract: Aspects of the present disclosure include a heat brush with a handle and a base. The base includes a heating surface and a bristle that has a protrusion. The protrusion may have any of several structures. Other aspects are also described and claimed.

Abstract: A variable diameter adjustable hair tool that includes a barrel with a number of plates. A heater included in the hair tool may transfer heat at a specified temperature to the plates. The heater may draw power from a power unit. The hair tool has a handle connected to the barrel that allows the user to hold the tool. The adjustable diameter is achieved by an actuator that alters the outer diameter of the barrel by changing the distance between a surface of the plates and a central axis of the barrel. The actuator may controlled by a control component that converts a user action into an action of the actuator. Other aspects are also described and claimed.