Stabilizer Types: 1. Semi-finished Forgings for stabilizer 2. Intergral spiral blade stabilizers String type, Near bit type 3. Integral straight rib stabilizers 4. Interchangeable sleeve stabilizers Size: from 6" to 28" Material and Description: AISI 4145 H, AISI 4145 H MOD Made from AISI 4145 H or AISI 4145 H Modified Alloy Steel material. Heat treated to 285~341 Brinell Hardness and 54 Joules minimum impact value. All physical properties would be guaranted 1" below the surface. All threads are made strictly in accordance with API specification. The hardbanding of stabilizers employ "pressed in" Tungsten Carbide alloy buttons or other anti-wear materials. All stabilizers should be ultrasonic tested.