This 5 pin male DIN tonearm plug replaces the arm base plug in REGA, LINN, ROKSAN, PROJECT, GRACE & many other arms  It matches to the 5 pin female DIN plug with gold plated brass pins in a standard tonearm configuration The body of the plug is outside diameter 11.6mm. x 10.2mm. long The variable diameter ring is inner diameter 11.6mm. x outside diameter 16mm x 10.2mm. long All of the pins are made from a high precision CNC process using  high-grade phosphor bronze material with 24K gold plating