Heller hss g super double ended drills 10 packs heller 21409 4 this 31mm hss g super double ended drill from heller is ideal for body shells and metalworking and for tubular rivet holes both ends can be used so it is twice as effective as an ordinary drill bit sold in packs of 10 heller 21409 4 0930 hss g super double ended drill 31 x 11 x 49mm 10 pack