Collet Shield LH -Fits Super Quick Chuck Left Hand models Q011 & Q019 with knurled Q606 stainless steel dust cover (ring) only The non-rotating Collet Shield covers the collet to provide a steady rest for more comfortable operation of your Wells Super Quick Chuck. It also helps protect rubber gloves. Removal is easy for cleaning around the collet. Note: Collet Shield has a groove on it's exterior to identify it as left hand.