Dragon bolt tips are attached to the tips of runite bolts, and can then be enchanted. Once dragon bolt tips have been attached to runite bolts, the bolts become dragon bolts.
Dragon bolt tips can be created through the Fletching skill. A player must have a Fletching level of 71 and take a cut dragonstone and use a chisel with it to make 12 dragon bolt tips, granting 8.2 fletching experience per dragonstone. There is a Make-x option for this, and it takes about 70 seconds per inventory of cut gems chiseled into tips.
Attaching dragon bolt tips to Runite bolts to make Dragon bolts also requires a Fletching level of 71, and for each dragon bolt tip attached to a Runite bolts, a player is granted 8.2 Fletching experience.