High grade tool steel bits, hardened for ultimate wear resistance. The bits have 1/4 inch hex shanks to fit the quick chuck. specification:. Overall length=150mm. Shank diameter=1/4 inch hex. alternatives::. Trend snappy pozi no 3 bit pack of 3 tr_snap/pz/3. accessories::. Trend snappy metal rack red tr_snap/rack/1. related products::. Trend snappy quick chuck only tr_snap/qc.