6-5/8 O.D. Adapter Sub furnished with 4-1/2 I.F. Box (with

6-5/8 O.D. Adapter Sub furnished with 4-1/2 I.F. Box (with 36 Long Fishing Neck) Top Connection with Special Boreback and peened threads. Bevel diameter to be 6.344 with 3 Mill Slots.f/ Logan Spear Packoff Assembly.