| 摘要 |
Tool for making holes in a fire-sealing lead-through including an elastic, fireproof, foamed material, which is kept in compression at right angles to the longitudinal axis of the holes therein. The tool has a hole-making bar portion (2), provided with teeth (9) formed and arranged for hole-making correctly suited to such compressed foamed material. Adjacent to the hole-making part (2), the tool also has tapering driving part (1). |
