This is zinc-plated steel disc designed for use with VDO induction sensor 340-804-006-007 or the 340 017 hall-effect sensor. (Not for use with 340 002 - M8 Speed sensor)
This is a universal design for fitment between the prop-shaft flange and the differential flange and is 150mm in diameter. The disc has 15 ferrous segments between 15 holes that create a pulse signal for the speedometer. The disc is approximately 1.5mm in thickness.