Block DC to prevent from leaking to subsequent circuits or test instruments. This RF DC block bias tee possess multi, stable structure and high work efficiency. The RF DC block also can be used to inject communication data through the RF end. Made of aluminum alloy material, which is corrosion resistant and excellent in quality. Used for RF power supply of active antennas and block DC output of broadband amplifiers. Colour:Silver+gold Material:metal Size:33mm x 33mm Package Contents: 1 * RF DC Block 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.