ITEM NAME:1/4"Hex Shank Adapter Male Thread Screw for Drill Chuck 6mm/10mm/13mm 3/8"-LJ 1/4"Hex Shank Adapter Male Thread Screw for Drill Chuck 6mm/10mm/13mm 3/8"-LJ a.imagelink a:hover.imagelink {color:#AF070B;.1 x Hex Shank Drill Chuck Adapter. Keyless Chuck Size: approx. Mount type: 24unf (3/8"). Clamping range: 2-13mm.