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2. Sandpaper - Wikipedia

   en.wikipedia.org/wiki/Sandpaper

   Examples of sanding discs using a quick-change mounting system. A quick-change system is commonly used with disc-type coated abrasives. A plastic or metal hub is bonded to one of the faces, which is threaded. This then mates directly to the sander or angle grinder or to a mandrel that can be mounted in a sander, grinder, or drill. The advantage ...

3. 125 mm smoothbore ammunition - Wikipedia

   en.wikipedia.org/wiki/125_mm_smoothbore_ammunition

   Entered service in 1962. Uses the 3V-21 detonator (mass = 0.431 kg, reliability = 0.98). The 90% lethal zone for infantry is reported to be 40 m wide and 20 m deep. [1] Country of origin: Soviet Union; Round weight: 33.0 kg; Projectile weight: 23.0 kg; Muzzle velocity: 850 m/s; Max dispersion: 0.23 mil (0.23 mrad) Charge weight: 3.148 kg ...