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OPTI-LOK™ Adapters offer maximum flexibility for making connections between your 1/4-28, M6 (Metric), Luer and 10-32 fittings and ports. They are available in a useful variety of thread-type combinations, and are produced without the use of mold-manufacture techniques - they are all individually machined. Each adapter we sell is individually inspected for paramount quality in the finished product. This ensures consistent threading into fitting ports, and longer thread life.