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.

| Model | GPS-301N (No Vacuum) | GPS-301C (Central Vacuum) | GPS-301S (Self-Generated Vacuum) |
| Pad Size | 3", 3-1/2", 5", 6" | 5", 6" | 5", 6" |
| Max Speed | 11,000 RPM | ||
| Net Weight (No Pad) | 0.63 kg | 0.67 kg | 0.66 kg |
| Length (No Pad) | 158 mm | 220 mm | 210 mm |
| Height (No Pad) | 82 mm | ||
| Air Cons. | 0.31 m3/min 10.9 cfm | ||
| Air Inlet | 1/4" | ||
| Hose Size (I.D.) | 6.5 mm | ||
| Air Pressure | 90 psi | ||
| Sound Pressure | 82 dBA | 85 dBA | 85 dBA |
| Vibration | < 2.5 m/sec2 | ||
| Diameter Orbit | 2.5mm (3/32") for Ultra-Fine Sanding 5.0mm (3/16") for General Sanding | ||
| 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 | ![]() | ![]() | |
| 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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