ER Collet chuck with opening diameter from .012” to .312 (.3mm – 8mm). ER Collet Chucks are great for holding small diameter parts. This piece has a threaded through hole to add a depth stop and a brass tipped set screw on the side to fasten it. Made from 303 stainless steel for corrosion resistance and durability. Multiple collet chucks may be combined into a multi-part setup. Can be used on Loc-N-Load™ plates or on 1/2″ and 1″ hole patterns and for M6 or 1/4-20 threaded holes.