... , SPT 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 diameter ... : 8 ml/r4) Rated speed: 1500 rpm7. Power Diesel Engine 12.1 kw/2000 rpm mini crawler drilling machine for soil testing, SPT ...