High quality drill chuck suitable for use by the professional or occasional user. This is a keyless chuck so no key is required. Perfect to convert your drill to a keyless chuck. Quick and easy to change bits and attachments. Standard 3/8" x 24 UNF thread. This will fit virtually all drills with an existing 10mm chuck. Not suitable for use on drills using a hammer action. Drill capacity 0.8mm 10mm For use on mains powered, cordless drill and drill drivers.