Hex Plastic Housing. 6.35mm Socket To 3.5mm Plug. Hole Diameter 3.5mm/0.14 ; Total Size(approx.) 53 X 12mm / 2.1 X 0.5 (l*w) Easy To Use Ordinary 3.5mm 6.35mm Headphone Jack On The Amplifier. Package Content 2pcs X Audio Adapter A Great Solution To Many Problems