Sir 0750 P16 Internal Threading Holder 3/4" Round Rh Boring Bar Internal Lay Down Threading Holder For Size 16 Inserts Sir 0750 P16 Internal Threading Holder 3/4 Inch Round Right Hand Boring Bar Internal Lay Down Threading Holder For Size 16 Inserts N Threading Holder For Size 16 Inserts Tmx Toolmex Part #6-Sir-750-P16