In construction projects, pneumatic drill bits play a crucial role in groundwork, foundation drilling, and tunneling. They facilitate the creation of holes for anchoring, installing pipes, or setting explosives in mining operations They facilitate the creation of holes for anchoring, installing pipes, or setting explosives in mining operations
Figure 2.11. Rubber enclosed metal seal

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Why do I have to install my Oil Seal this way?
The basic principle of sealing is straightforward – the flexible lip is held against the rotating part (usually the shaft) whilst the casing (or O.D.) is pressed into the housing or bore and holds the seal in place. The sealing lip needs some form of lubrication to avoid overheating and is usually energized by means of a garter spring.
What are Oil Seals - Guide to what an Oil Seal is used for

Oil seals can offer:
When the total eccentricity is excessive, the sealing edge of the seal lip cannot accommodate shaft motions and leakage may occur.
Total eccentricity is the sum of shaft runout and the housing-bore eccentricity.
Total eccentricity, shaft runout and housing-bore eccentricity are generally expressed in TIR (Total Indicator Reading).
JTEKT provides special seals for use in a wide variety of machines and applications.
Table 5 lists the major special seals, their shapes, and their features.
3. Seal types and numbering system
Among the most common causes of oil seal failure are: