This paper draws up a brief inventory of productions in flint of the Grand-Pressigny region discovered on the sites of northern France, connected with Deûle-Escaut, regional group of Late Neolithic. The results of recent excavations and multidisciplinary studies on structured and well dated settlements suggest a diffusion network of large blades produced on nucleus “livre-de-beurre” from 29th BC bound for these sites. Production sites are taken away about 500 km. At the same time, but in very lesser proportion, long blades in Bartonien flint of Paris Basin using pressignian technique, reach in northern France. This accords with the increasing diversification of finished products imports in the Late Neolithic. The inventory also lists objects discovered by prospecting more numerous than items found in archaeological context. The inventory (not exhaustive) gathers 225 blades in flint of the Grand-Pressigny region to which are added 54 daggers in Bartonian flint of Paris Basin. The distribution of these long blades shows clear disparities. It seems that some sites are excluded from the distribution while others concentrate the main part of imports. Import seems particularly important towards the sites of the Scheldt and especially the Deûle valleys. Here the sector of Houplin-Ancoisne, densely occupied during 3rd millennium BC, is especially remarkable. This corpus consists almost exclusively of revived, broken and/or recycled blades of daggers from which some are characterized by scarf retouch or polished back. The typo-functional analysis allows to approach their status and their function. Because of the reduction of these blades, the wears due to their initial use cannot be observed. Eleven blades have been analyzed. All have multiple used zones on their edges but also on their surface and dorsal ridges, even on the fracture. Sometimes, use wears are superposed. These blades seem to hold an important role in acquisition and transformation of various plants. The observed traces seem relatively close to those on several whole daggers of Netherlands described by Annelou Van Gijn. She suggests that these daggers were slid into a sheath in bark or in another plant material, even in leather. These use wears are very different from intense one left by cropping cereals or other plants, frequently described about pressignian blades and fragments in southern contexts. Despite the difficulties in wears identifying, it turns out that modalities of use, functioning or manipulation are recurring. The morphology of the support and the localization of some wears show that, even far from its original shape, the nature of the material or the characteristics of the tool seem to be still attractive enough for using it extremely in domestic context. The status of these technically over-invested blades and their value (of display, exchange ?) opposite the abundance of their production, the intensity of use and their rejection in detrital layers on the Deûle-Escaut settlements are discussed. The Deûle-Escaut settlements are an important pole diffusion of long blades daggers from the region of Le Grand-Pressigny. These blades represent on average 1,4% of the tools on excavated settlements (between 0,5 and 2,3%). Bartonian flint daggers occupy a secondary place corresponding to one for ten pressignian. These productions of same technology are not in competition; they are of a complementarity diffusion networks. These long blades take on a display value in a social competition context where they are competed by the first copper daggers and intensification of long distances exchanges. This specialized production is designed for distribution and for exchange. But the abundance of these blades and their states of preservation and/or abandonment partially translate the complexity of the phenomen. It seems that there is a contradiction between their precious value and their massive production. The functional analyses seem to attribute to pressignian blades an important role in acquisition and processing of various plants and show that the same uses are assured by others local tools. Here also technical need is not the reason of their import. Sociological research shows that the fact of exchange dominates on the necessity of the good acquisition. Exchanges, essential in the social functioning of these societies, constitute a fundamental mode of integration which can limit conflicts. So what could be the object of exchange? Were these exchanges symmetric, of the same value? Were blades exchanged for materials, intangible or symbolic assets: prestige, gratitude, alliance, marriage…? It still seems very difficult to answer it.