Proxxon pd400 engineering lathe system proxxon 24419 the proxxon collet chuck and collets are set for for accurate use on round components with the proxxon pd400 lathe the set includes one each of collet sizes 20 30 40 50 60 80 10 and 12mm as well as one soft collet for making your own customised sizethese collets give concentric accuracy better than 02mm much better than a chuck the included collet attachment is mounted in the place of the headstock chuck proxxon 24419 co