Các loại mũi khoan chuyên dụng (Specialty Drill Bits)

For those who are having trouble drilling holes in tight corners and around pipes and other obstacles, these are for you. With 4 different angles of drill bits and 2 different obstacle avoiding shapes one of these is sure to work. They are all for 1/2" holes but can be scaled before being printed for different sized holes. Definitely not meant as a joke, I'm 100% serious.