• Diameter：600~3000（mm）

pply rock：soft to stiff silt and clay, loose to medium 

Main application stiff to hard silt and clay, loose to dense sand and gravel  up to coarse gravel  is recommended in uncased bores or for bigger diameters and for secant pile walls. Features Kellybox 200 mm round shank chisel pilot bit RP4, teeth FZ and collar plate with round shank chisels ventilation pipe