4 M10 Speaker Spikes Black. M8 (10mm) x height approx. 20mm x height approx. M6 screw pitch: 1.0MM/M8 screw pitch: 1.25MM/M8 screw pitch: 1.5MM. Height of speaker spike pad: 4mm. Function: The speaker shock base pad is used between spike and ground, to minimize the harmful vibration.