1. Very compact structure, Less of the-easy-to-damage-parts, very easy to control. It can adapt to these outside situations there is no water and no electronic power. 
2. It is a Kind hand held drill built up with gasoline engine, Air pump, rock drill and the rotation plumbum equipment for running or stop. 
3. It can be used for breaking, drilling, blasting, tamping splitting and ramming.
 
Gasoline rock drilling machine: YN27C/Pionjar 120
 
Advantages of hand-held rock drill: 
a: Reasonable design
b: Convinient operation
c: Fast drilling velocity
d: Engery-saving
e: Efficient
f: Long service life of parts
g: Parts highly interchangeable and reliable performance etc
h: Both hand held and with airleg available.