A turbine rotor blade for a turbine section of an engine , the turbine section including a shroud surrounding the turbine rotor blade , comprising: a platform ; and an airfoil extending from the platform into a mainstream gas path of the turbine section , the airfoil comprising a pressure side wall ; a suction side wall joined to the pressure side wall at a leading edge and a trailing edge ; a tip cap extending between the suction side wall and the pressure side wall ; a pressure side squealer tip extension inclined in a forward direction and extending from the pressure side wall at a first angle relative to the pressure side wall , the pressure side squealer tip extension comprising a first cooling hole that converges from an inlet to an outlet , wherein the pressure side squealer tip extension includes a forward wall having a forward surface that is coplanar with a forward surface of the pressure side wall, wherein the pressure side squealer tip extension terminates at a radial wall , and wherein the outlet of the first cooling hole is at least partially formed on the radial wall ; a suction side squealer tip extension inclined in a forward direction and extending from the suction side wall at a second angle relative to the suction side wall , wherein a junction between the suction side squealer tip extension and the suction side wall is curved; and an internal cooling circuit configured to deliver cooling air to a gap between the pressure side squealer tip extension and the shroud via the first cooling hole . a platform ; and an airfoil extending from the platform into a mainstream gas path of the turbine section , the airfoil comprising a pressure side wall ; a suction side wall joined to the pressure side wall at a leading edge and a trailing edge ; a tip cap extending between the suction side wall and the pressure side wall ; a pressure side squealer tip extension inclined in a forward direction and extending from the pressure side wall at a first angle relative to the pressure side wall , the pressure side squealer tip extension comprising a first cooling hole that converges from an inlet to an outlet , wherein the pressure side squealer tip extension includes a forward wall having a forward surface that is coplanar with a forward surface of the pressure side wall, wherein the pressure side squealer tip extension terminates at a radial wall , and wherein the outlet of the first cooling hole is at least partially formed on the radial wall ; a pressure side wall ; a suction side wall joined to the pressure side wall at a leading edge and a trailing edge ; a tip cap extending between the suction side wall and the pressure side wall ; a pressure side squealer tip extension inclined in a forward direction and extending from the pressure side wall at a first angle relative to the pressure side wall , the pressure side squealer tip extension comprising a first cooling hole that converges from an inlet to an outlet , wherein the pressure side squealer tip extension includes a forward wall having a forward surface that is coplanar with a forward surface of the pressure side wall, wherein the pressure side squealer tip extension terminates at a radial wall , and wherein the outlet of the first cooling hole is at least partially formed on the radial wall ; a suction side squealer tip extension inclined in a forward direction and extending from the suction side wall at a second angle relative to the suction side wall , wherein a junction between the suction side squealer tip extension and the suction side wall is curved; and an internal cooling circuit configured to deliver cooling air to a gap between the pressure side squealer tip extension and the shroud via the first cooling hole . <EOS>