S e c t i on 1 2 - P a ge2 May 2013 Drill Bits • spade and wing bits • for wet and dry drilling • diameter 26 to 30 mm typical • thr ead shanks M16 or " whitworth • or spigot shanks in small fgur e 8, 3 / 8 " squar e or " x 3 / 8 " Drill Rods For dry drilling – fabricated scr oll or twisted scalloped type • pinned or thr eaded joints available • dif fer ent drive ends to suit bolter ( 7 / 8 " hex, squar e drive, etc) T ools Har dwar e, Drilling Consumables continued www .dsiundergr ound.com