A standard Allen wrench can be used to remove or install the tube base bolts.
But it won't help to properly torque the bolts on installation.
A short Allen wrench adapter, short extension and a 3/8“ socket wrench works well for removing / installing the bolts.

The short Allen adapter and extension brings the wrench to the smaller OD area of the tube. A beam type torque wrench with a small head will then work for proper torque on the bolts. 1)