... testing drilling rig with capacity of 100m/nq capacity, suitable for soil testing, SPT testing Mini Crawler Drilling Rig.Suitabble ... for diamond core drilling, carbide core drilling, SPT test drilling, small ... ): 15 knDrum speed: 19,38,84,168 rpmDiameter of the drum: 145 mmDrum Circumferential velocity (two layers): 0.166,0.331 ...