Tough to get a side view...top two are made from a half of a deer rib bone, ground flat on the marrow side and a median ridge on the other with an edge like a dull axe. Even considering the age of these,I think that edge design(not super sharp)was for strength, I also have awls and punches from the same site that are very much more pointed and sharp... I have taken deer bone leg and made points, I'll have to dig them out, you can get a super sharp edge by polishing with fine sand-paper, but have never shot them, lightweight may be a problem?...Bone useage to make tools was very common and a single deer would provide just a pile of tool's from hoe's made from shoulder blades, awls and punches from small bone joints and shattered larger leg bones, to beads made from the toe bones and bangles from dew claws.