Application:This Speaker Panel Mount Connector is mainly used for docking with four-core card ohms male head. It is suitable for mixers, amplifiers, audio equipment, etc. It is the first choice for audio projects such as karaoke, concerts and public broadcasting. Specification:Product Name : XLR Female Jack Panel MountColor : Silver ToneUse Way : Wiring Contact Pin Quantity : 4 PinHole Diameter : 3.4mm / 0.137"Mounting Diameter : 21mm/ 0.82"Total Size : 35mm x 26mm x 33mm (L x W x H) Package Included:1pcs x XLR Female Jack Panel Mount Description:1.Full metal housing provides optimum overall RF protection and electromagnetic shielding2.Dual grounded design for excellent contact integrity between the base and cable connectors3.The 9-pin female has a unique cage contact that enhances conductivity and reduces wear when male to the male4.The female contacts have a soldered bar to prevent soldered from entering the mating area5.Larger soldered cup contacts make soldered easier6.Optional pin 1 is easily connected to the base ground