Features: Female socket connectors, welding type connection, easy installation. Effectively isolate electromagnetic interferences, resists oxidation without attenuation, wear-resistant. Full sound, balanced and clear, stable transmission. Connection terminals block, with a total length of 28.2mm and installation hole diameter of 11mm. Suitable for devices such as loudspeakers power amplifiers and more. Specifications: Material: Rhodium plated Size: approx. 28.2mm/1.11inch, see the pictures Installation hole diameter: 11mm/0.43inch Mainly used for auditory equipment such as speakers, loudspeakers, amplifiers and more Wiring type: Welding type (note: This is a plated product and cannot be soldered during welding. It is best to scrape off the plated layer a little at the soldering location and then solder it) Package Includes: 1 Pair Female Connectors note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.