... Description specialize in machining diamond tools steel back,Our current products include:1) Abrasive discs steel back, size 4-7", single/double ... /abnormity holes, with/without spanner bits, etc,2) Drill bits steel back, OD 23.6-80mm, length 82/135mm, with 2 ... or 3 grooved, etc,3) Materail: steel 45#, or others4)Certificate: ISO9001:20005)Our equipments: CNC, automatic ...