| 摘要 |
The procedure consists of using a hollow cylindrical hole saw (3) in a plastic guide cover (4) with projecting points (1) to make a hole through a dry partition for an electrical installation. The procedure consists of using a hollow cylindrical hole saw (3) in a plastic guide cover (4) with projecting points (1) to make a hole through a dry partition for an electrical installation. To avoid damage to an existing cable (10) or conduit the hole saw has no inner drill bit, but is fixed to an electric drill chuck by an external shank (7) only. The end of the existing cable is inserted into the hole saw while the hole is being made. The hole saw has teeth (9) suitable for cutting through hard materials
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