Sil 0750 P16 Internal Threading Holder 3/4" Round Left Hand Boring Bar Internal Lay Down Threading Holder For Size 16 In Sil 0750 P16 Internal Threading Holder 3/4 Inch Round Left Hand Boring Bar Internal Lay Down Threading Holder For Size 16 Inserts Threading Holder For Size 16 Inserts Tmx Toolmex Part #6-Sil-750-P16