Well tool device with actuation device in through opening of frangible disc

A well tool device, comprising:

• a housing comprising a longitudinal through bore having a first end and a second end;
• at least one frangible obstruction device provided inside the longitudinal through bore, wherein fluid flow between the first end and the second end is prevented due to the frangible obstruction device;
• wherein the housing prevents motion of the at least one frangible obstruction device in either direction parallel to the longitudinal through bore,
• wherein the at least one frangible obstruction device comprises a through opening,
• wherein the well tool device further comprises an actuation device extending fluid-tight at least into the through opening,
• wherein the actuation device comprises an actuation tool connection interface,
• wherein the actuation device comprises at least one disintegration device,
• wherein the at least one disintegration device is configured to be at least partially moved into the at least one frangible obstruction device and thereby provide disintegration of the at least one frangible obstruction device, hence allowing fluid flow between the first end and the second end of the longitudinal through bore,
• wherein the disintegration device comprises protrusions protruding radially from the actuation device, and
• wherein the protrusions comprise at least one member of a group consisting of pins, spikes, blades, and knives.