In the past I have typically used 1/4 inch aluminum rebar because it bends by hand fairly easily and still provides adequate support . For rebar that requires less support or strength, I use AMACO 1/8" aluminum wire. But also much harder to bend). As far as "flexibility" goes, this 1/4" bends into smooth curves quite easily . However, sometimes I need tools or clamps to create a sharper curve. However, using aluminum wire tools can sometimes present a problem. Because aluminum rebar is so soft, it can be easily damaged, gouged, or flattened with tools to any degree of crushing. What works for me is to insert the anchor wire into a short (1 inch) length of copper or steel tubing. I leave the rest of the stiffer metal tubing and choose a short length that slips over the anchor wire. If it's important that the wire doesn't deteriorate in any way, you can even wrap it in a small piece of felt, latex, or cloth and then put it in a metal tube sleeve. Using a short metal sleeve helps me by protecting the aluminum wire, instead of clamping pressure on the pipe sleeve. Unlike the unsealed 3/8" Richeson anchor wire, I was pleased that this 1/4" version came cellophane wrapped. Due to aluminum's softness, they usually come into their best shape with no nicks or scratches when sealed in plastic. Damage may seem like a minor issue, but nicks can affect the lasting strength of aluminum rebar for purposes that require multiple repeated back and forth flexes at the same point (e.g. stop motion animation). Repeated bending directly at the site of a nick or defect can result in a broken wire at that point.
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