| 摘要 |
A drill steel includes a drill bit and a reamer bit. The drill steel rotates the drill bit to form a hole in a work surface and drives forward to insert the reamer bit into the hole. The reamer bit includes a plurality of inserts positioned on a cylindrical drilling surface to ream out the hole by carving channels in the hole interior surface. The inserts include cutting elements that have radiused or arcuate edges.
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