Use the Blade CAPture to store your used rotary blades of all sizes and all hand and machine sewing needles. The Blade CAPture was designed to fit all wide mouth canning jars (Ball and Kerr are the most popular but we tested with generic canning jars as well). There is a tapered slot that makes it easy to insert the blades into the jar but it is difficult for them to come out. A tapered hole makes it easy to drop in used hand and sewing machine needles, but they do not come back out. Please note that Blade CAPtures are not child safe so take care to keep your jar of blades and needles away from young children.