near bit stabilizer, as per API 7-1 Standard. Standard: API Spec. 7-1 O. D: 6" ---36" Material: AISI 4145 H Modified Allouy Steel, and Non-mag material Type: Near bit and string type The products are made strictly as per API 7-1 standard with test certificate. And we also cooperate with International Inspection--BV Inspection or you can assign any reliable Third Party Inspection. Welcome your inquiry.