Bolts. Bolt anchors which are difficult(dangerous) to access.
Start In the chimney to the left of the thin flake and in front of a slabby block. Step up(~3 feet)and stem right(do NOT climb 10-15' up the chimney in spite of what is written elsewhere)to reach the very base of the flake(below the first bolt). Climb the face of the flake avoiding the wall to the left(not even once!)and treading lightly at the hollow and fractured flake just below the top. Great climb.