1/4" ultra slim professional phone plug. Heavy duty mono (2-pole). A-gauge 6.35mm jack plugs with slimline bodies and chuck-type strain relief. The overall diameter is 14.5mm, making them suitable for even the highest density jackfields (15.88mm jack pitch). They accept cables from 4.0mm to 7.0mm diameter, and have precision-machined one-piece contacts.Nickel body with Nickel plated contacts.