6 piece drill bits for glass with 14 hexagonal collet 3 4 5 6 8 10mm short made of solid hss steel drill bit with a 14 hexagonal quick change adapter very short best suited for use in combination with an angled gearbox or applications in very tight places very stable as milled from one piece not suitable for hammer drill content 1 each of drill bit 3 4 5 6 8 10mm in practical aluminium box