Sir 1500 T16 Internal Threading Holder 1-1/2" Round Rh Boring Bar Internal Lay Down Threading Holder For Size 16 Inserts Sir 1500 T16 Internal Threading Holder 1-1/2 Inch Round Right Hand Boring Bar Internal Lay Down Threading Holder For Size 16 Inserts Own Threading Holder For Size 16 Inserts Tmx Toolmex Part #6-Sir-1500-T16