Made from AISI 4145 H or AISI 4145 H Modified Alloy Steel and Non-mag material. Heat treated to 285-341 Brinell hardness and 54 Joules minimum impact value. All physical properties would be guaranteed 1" below the surface. All threads are made strictly in accordance with API specification. The hard banding of stabilizers employ "pressed in" Tungsten Carbide alloy buttons or other anti-wear materials. All stabilizers should be ultrasonic tested.