Pack-off Assemblies are available for all of our Spear Assemblies and are designed to efficiently pack-off all sizes of drill pipe, tubing and casing. Circulation through the fish is enabled by attaching the Spear Pack-off Assembly to the bottom of the spear with a sub type nut. The standard bottom nut is a bullnose nut. Optional nut types — sub, mill, and sidehill — are available.