2 Pcs Chuck Head 13mm 
. Material : Carbon Steel
. Size : 13mm ( 1/2" )
. Thread Size : 1/2" x 20 UNF
. Clamping Range : 1.5mm to 13.0mm
. 1 Pcs 13mm Chuck Key
. This is a heavy-duty, metal keyed drill chuck designed for power tools.
. The set typically includes the chuck and a chuck key for tightening and loosening bits.
. It is suitable for use with various electric drills and machinery.