The hss drill bit is gripped by a spring steel collet into the hex shaft. The hex shanks snap into the quick chuck. specification:. D=1.0mm. Shank diameter=1/4 inch hex. alternatives::. Trend snappy 1/16 drill & adapter tr_snap/d/2. spare parts::. Trend snappy 1mm drill only tr_wp-snap/d/1mm. accessories::. Trend snappy hex protector for 1/4 hex tr_snap/hp. Trend snappy metal rack red tr_snap/rack/1. related products::. Trend snappy quick chuck only tr_snap/qc.