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The air leg rock drill is suitable for use in rock hardening and tilting holes, and can also be used vertically upwards to cut anchor holes on the roof. It is best suited for large-scale mines, medium-sized mines, and tunneling operations. This pusher leg rock drill holds more than 70% of the market share in the Korean market.
YT28 Rock Drill Jack Hammer is an efficient drilling machinery. It is widely used in mine roadway excavation and a variety of drilling operations including rock blasting, metallurgy, coal, railways, transportation, water conservancy construction, and national defense stone engineering.

| Type | YT28 |
| Weight | 26 (Kg) |
| Length | 661 (mm) |
| Cylinder dia | φ80 (mm) |
| Piston stroke | 60 (mm) |
| Working pressure | 0.4~0.5 (Mpa) |
| Impact energy | ≥60.2 (J) |
| Impact frequency | ≥37 (Hz) |
| Air consumption | ≤81 (L/s) |
| Working water pressure | 0.2~0.3 (Mpa) |
| Air pipe inner dia | φ25 (mm) |
| Water pipe inner dia | φ13 (mm) |
| Rock drill hole dia | φ34~φ42 (mm) |
| Rock drill hole depth | 5m |
| Shank size | 22×108 (mm) |
| Rotary speed of rock drill | 45 cm.min-1 |












