Ball Bearing Chuck, K3, 0.04 in to 0.5 in, Tapered no checkout T style soil probe Non conductive Easy insert metal tip Non slip T style soil probe Non conductive Easy insert metal tip Non slip design makes it ideal for use in wet conditions Nuplaglas® handle Mounts to wall with provided screws Overhang protects bottles from dust and debris Twist off and keyholes for wear resistance Maximizes gripping force and drilling accuracy Treated to ensure thread life and high gripping surface hardness 1 piece fluted sleeve construction Ball trust bearing reduces friction in chuck closing mechansim Through hardened sleeve teeth