This is a 3-piece BNC male crimp connector for use with RG58 cable.
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$0.53 at CableWholesale.com
This is a female BNC crimp connector end used to crimp RG58 cable.
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$1.00 at CableWholesale.com
Use this connection on an RG-6 cable to create a custom length BNC cable.
Buy it:
$0.71 at CableWholesale.com