Usage Tips:[Upgraded ]20Pcs RG59 BNC Compression Connector with fixed pin, you can insure the center wire goes into the connector more accurate, easier and quickly,doesn't get bent, other raditional bnc connector. Connector was very easy to use to rg-59 coaxial siamese cable, just use the coax cable core insert the compression connector pin and compress it. [How to Use Crimper Tools]Please make sure the tool suitable for the correct measurement suitable for these connectors,then tighten the connectors with cable, making the connection successfully is easier. 20PCS BNC Compression Connector works with most standard compression tools. [Widely Application]RG59 connector suitable suitable for use in the cctv home security systems camera installation, theater, audio & video cable, made to work in any weather condition, suitable for indoor/outdoor use. Compatible with all CCTV analog, AHD, TVI and SDI home security high-definition camera surveillance system. [Weather ] Heavy-duty well constructed DC barrel jack BNC connectors HD video cables suitable for reliable coaxial RG59 720p, 960P, 1080p CCTV AHD and SDI coax HD video cables connection. Extremely low signal attenuation construction, - nickel-plated, All metal fully sealed-watertight,improved conductivity, permanent connection never comes loose. Colour: as shown Material: Metal Package Contents: 20 x RG59 BNC Compression Connector (with 20Pcs Copper Pin) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.