Length: 16.5mm Width: 6.0mm Thread Diameter: 4.9mm This is for 3 PAIR of Vito's Performance MAIN HEX JETS for a KEIHIN carburetor sizes: 165, 170, 175 We use them for Banshee and Blaster aftermarket carbs quantity: 3 pair = 6 total jets Carburetors: CR Special, all FCR?s, FCR-MX, PE, PJ, PWK, PWM.