Compatible with Satellite (Including DIRECTV and Dish Network), Cable TV and Internet (including Comcast, Cox, and Charter), and Off-Air Antenna systems.Manufactured from high quality, weather resistant material for exceptional quality and extremely low signal attenuation.Weather Proof Rear, and Internal O Rings allow for long-term outdoor and indoor useDesigned for standard prepared coax tip' of 1/4" braid and 1/4" exposed center conductor - use with any standard 21mm compression tool (THE CIMPLE CO tool is recommended, but not required)Pack of 10, 21mm Compression FittingTHE CIMPLE CO, A Family Company located in the USA, is proud to offer these high quality and durable coaxial compression connectors, also known as coax fittings. Compression F81 Connectors, using the F-Pin connection (standard on US Cable systems). Compression Connectors are superior to Crimp and Twist, as they create a waterproof seal at the rear of the connector (the jacket side), and allow a uniform 360 degree connection that keeps the connector on, and the signal tight. Rated from 2MHz 3GHz, this ensures that the coupler will handle all of the signals for DIRECTV, Dish Network, other Satellite, CATV (including Comcast, Charter, Cox, and more), as well as Antennas, VCRs, Cable Internet Modems, and other digital and analog systems. These will pass signal for 75Ohm coax wires. The connector works with most RG59 Coax, including Dual Shield, Tri Shield, and Quad Shield. Exceptional return loss and insertion loss specifications. Shielding effectiveness is greater than -90dB.