... testing Mini Crawler Drilling Rig.Suitabble for diamond core drilling, carbide core drilling, SPT test drilling, small water well drilling, hydro exploration drilling.Drilling Capacity 1) Hole ... ,84,168 rpmDiameter of the drum: 145 mmDrum Circumferential velocity (two layers): 0.166,0.331,0.733,1.465 m ... . Power Diesel Engine 12.1 kw/2000 rpm mini crawler drilling machine for soil testing, SPT testing