▁and ▁exit ▁holes ▁and ▁prevent ing ▁burning . ▁A vo iding ▁burning ▁is ▁a ▁question ▁of ▁using ▁sharp ▁bits ▁and ▁the ▁appropriate ▁cutting ▁speed . ▁Dr ill ▁bits ▁can ▁te ar ▁out ▁ch ips ▁of ▁wood ▁around ▁the ▁top ▁and ▁bottom ▁of ▁the ▁hole ▁and ▁this ▁is ▁und es irable ▁in ▁fine ▁wood working ▁applications . ▁ ▁The ▁u bi quit ous ▁tw ist ▁dr ill ▁bits ▁used ▁in ▁metal working ▁also ▁work ▁well ▁in ▁wood , ▁but ▁they ▁tend ▁to ▁chip ▁wood ▁out ▁at ▁the ▁entry ▁and ▁exit ▁of ▁the ▁hole . ▁In ▁some ▁cases , ▁as ▁in ▁holes ▁for ▁rough ▁car p entry , ▁the ▁quality ▁of ▁the ▁hole ▁does ▁not ▁matter , ▁and ▁a ▁number ▁of ▁bits ▁for ▁fast ▁cutting ▁in ▁wood ▁exist , ▁including ▁sp ade ▁bits ▁and ▁self - feed ing ▁aug er ▁bits . ▁Many ▁types ▁of ▁special ised ▁dr ill ▁bits ▁for ▁b oring ▁clean ▁holes ▁in ▁wood ▁have ▁been ▁developed , ▁including ▁br ad - point ▁bits , ▁For st ner ▁bits ▁and ▁hole ▁saw s . ▁Ch ipping ▁on ▁exit ▁can ▁be ▁minim ized ▁by ▁using ▁a ▁piece ▁of ▁wood ▁as ▁backing ▁behind ▁the ▁work ▁piece , ▁and ▁the ▁same ▁technique ▁is ▁sometimes ▁used ▁to ▁keep ▁the ▁hole ▁entry ▁neat . ▁ ▁Hol es ▁are ▁easier ▁to ▁start ▁in ▁wood ▁as ▁the ▁dr ill ▁bit ▁can ▁be ▁accur ately ▁position ed ▁by ▁pushing ▁it ▁into ▁the ▁wood ▁and ▁creating ▁a ▁dim ple . ▁The ▁bit ▁will ▁thus ▁have ▁little ▁t endency ▁to ▁w ander