The Switchcraft S267 is a .206 inch commercial plug designed For applications requiring polarization (use of plugs of different sizes) to prevent insertion of incorrect equipment Littel-Plug phone plugs featuring a sleeve and tip diameter of .206 inches are available. Mate with Number S128 Extension Jax and S11 Littel Jax jacks. Number S260 used interchangeable with Military Type M642/51 (Switchcraft Number 480) plugs. Mate with jacks S12B, S13B, M444, MT342B, MT344B and others.