The Five Nails (tib. gZer lNga) are the Northern Treasures (Byang gTer) accumulation praxis (Ngöndro) which has to be practised before the Drubkor Nam Sum (tib. sGrub sKor rNam gSum), which consist of Drowa Kundrol (‘Gro Ba Kun Grol), the outer sadhana of Chenresig, who frees all beings (tib. Thugs rJe Chen Po ‘Gro Ba Kun Grol), the inner sadhana of Rigdzin Dungdrub (tib. Rig ‘Dzin gDung sGrub) and the secret sadhana of Thug Drub Dragpo Tsal (tib. Thugs sGrub Drag Po rTsal). The Five Nails are also the preparation for the Gongpa Zangthal cycle. Here we have a short commentary on the the accumulation praxis by Tulku Tsurlo, one of the greatest Tibetan scholars of the last century and main teacher of Chhimed Rigdzin Rinpoche and others also known as Tshulthrim Tsangpo.