New 1/2" & 3/8" Power Drill Chuck Conversion Kit Durable Hex Adapter Chuck Conversion Kit Specification * *Durable 3/8" Chuck With 1/4" Hex Shank & 1/2" Dr. x 1.4" Hex Adaptor *Thread : 3/8" - 26THD * Capacity : 1/16" - 3/8" *Adapter : 1/2" Square x 1/4 Hex