This quick chuck with a sturdy handle, allows the use use of all snappy shank direct drive tools. supplied with a magnetic screwdriver holder & no.2 pozi bit. specification:. Shank diameter=1/4 hex. accessories::. Trend snappy pozi bit mix pack of 3 tr_snap/pz/123. Trend snappy phillips bit mix pack of 3 tr_snap/ph/123. Trend snappy magnetic drive/holder & pozi tr_snap/msh.