Machine description: 3.5 - 4.5 Inch Class*, Long Mast 20' FT Steel*, Cat Engine*, Unit is still in use.,, 2005 Atlas Copco ROC D7-11 LF, These Photos were taken March 29th, 2016 when the unit had 5798 engine hours & 1494... more info about the 2005 Atlas Copco ROC D7-LM.