直螺旋钻斗
直体螺旋设计，方便携渣；
双头螺旋受力均匀，不宜偏孔 ;
双螺旋携渣能力强，黏性地层，单螺易于卸渣 ;
适用地层：黏土层，强风化层，碎石层 ;
1.Soft to stiff silt and clay, loose to medium dense sand and gravel.
2.The single cut and double cut augers with side cutters are suitable for drilling in hard clay, silt and medium to high dense sand and gravel.
3.Single cut auger are recommended up to coarse gravel.
