... -leg Rock Drill yt27,yt24,yt28: pneumatic breaker tools,mining tools,rock tools,rock drill,leg drill,atlas copco,drifters Air-leg Rock Drills yt27,yt24,yt28 ... application:YT27/YT24/YT28 Air-leg Rock Drills ... Water pipe inner dia φ13 (mm) Rock drill hole dia φ34~φ42(mm) Rock drill hole depth 5 (m) Shank size 22 ...