well simple answer is they can be, but not the way they are sold. The have a steel screw inside them and a spring. so if you were to find a suitable stainless or plastic replacment for the spring and screw then they would be fine. I was looking at another brand that is 100% plastic construction, I will see if I can find out what they were called again.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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