Proxxon pd400 engineering lathe system proxxon 24412 the proxxon face plate and clamp downs pd 400 150mm is an accessory for the proxxon pd 400 lathe system that can be used in the place of the standard chuck for larger and asymmetrical workpiecesit has a diameter of 130mm with two through t slots as well as mounting clamps proxxon 24412 face plate and clamp downs pd 400 150mm