The EMG-152B Jax are standard 2 and 3 conductor phone jacks with extra long threaded bushing for mounting in panels/chassis up to 1.25in. thick. Long metal bushing virtually eliminates hum pick-up, and is ideal for microphone connections.

Specifications
Mounting Bushing:  Brass, Nickel plated with attractive knurled flange.
Insulation: Insulating spacer - XXP paper base phenolic. Insulator/ Spring Mount - Nylon.
Springs: Special alloy nickel silver.
Terminals: Tip - Nickel silver. Ring - Nickel silver.
Hardware: One nickel plated brass hex nut, One nickel plated brass flat washer.