At GISON, there are about 500 gauges and over 1,000 molds for any air hand tools' machining and manufacturing. Their one-stop production and design capability have allowed them to come up with solutions that are reasonably priced and competitive. At GISON, their processing is ISO-9001:2015 certified, CE approved products and their air hand tools are sold worldwide to 50 countries.

| Pad Size | Diameter Orbit | Non Vacuum | Central Vacuum | Self-Generated Vacuum |
| 6" | 2.5 mm | GPS-301N6A | GPS-301C6A | GPS-301S6A |
| 5.0 mm | GPS-301N6B | GPS-301C6B | GPS-301S6B | |
| 5" | 2.5 mm | GPS-301N5A | GPS-301C5A | GPS-301S5A |
| 5.0 mm | GPS-301N5B | GPS-301C5B | GPS-301S5B | |
| 3-1/2" | 2.5 mm | GPS-301N4A | ||
| 5.0 mm | GPS-301N4B | |||
| 3" | 2.5 mm | GPS-301N3A | ||
| 5.0 mm | GPS-301N3B |
| Features | ![]() GPS-301 |
![]() GPS-302 |
![]() GPS-303 |
![]() GPS-304 |
| Bearing-Oil Leakage prevention performs longer life. | O | O | O | O |
| Housing Shroud totally protects housing from dust adhesion. | X | ![]() |
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|
| No Spanners Needed when Replacing Pad. | X | X | O | O |
| Optional Safety Lever | X | X | O | X |
| Unique Cylinder-Air-Inlet ensures less maintenance damage. | O | O | O | O |
| 360 degree rotate + 33 degree swivel Exhaust Tube offers wide operating phase. (Vacuum Type) | O | O | O | O |
| 360 degree Adjust Exhaust Tube (Non-Vacuum Type) | O | O | O | O |

▦ Catalogs of GPS-301/302/303/304 Series Air Random Orbital Sander
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