▎ 摘　　要

NOVELTY - The drill has a main body provided with a cutter head (1) and a cutter handle (2). The cutter head is connected with the cutter handle, where diameter of the cutter head away from an end of the blade handle is gradually reduced. An outer wall of a cutting module (12) is provided with a reverse groove (14). A reverse blade (71) is formed between inner and outer walls of the reverse groove. The reverse blade is adapted for removing burr. USE - Drill bit for drilling space material e.g. aerospace material such as graphene composite plate and multi-layer fiber. Uses include but are not limited to a twist drill, a reamer, a deep hole drill, and a chamfer drill. ADVANTAGE - The burr in the drilling hole can be reduced and drilling precision can be improved. The cutting effect of the cutter head can be enhanced, while avoiding waste chips spirally wrapped on the cutting edge. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an installation structure of a drill bit. DESCRIPTION OF DRAWING(S) - The drawing shows a partial perspective view of a drill bit. 1Cutter head 2Cutter handle 11Cutting groove 12Cutting module 13Cutting edge 14Reverse groove 15Chip breaker 71Reverse blade