Section 1 of this International Standard specifies the material for and dimensions of equipment for wireline diarnond core drilling in solid or weakly fissured medium hard or hard formations to depths of 1 200 m to 1 500 m. NOTE 1 Cutting materials other than diamond may be used. It applies to equipment with outer bit diameters of 46 mrn. 59 mm, 76 mm and 93 mm with corresponding core diameters from 24 mm to 59 mm. Section 1 of this International Standard specifies the main dimensions of the following equipment: a) drill rods, b) diamond bits: c) reaming shells, core--lifter cases. core lifters, outer core tubes, retractable (inner) core tubes. NOTE 2 Holes drilled by CSSK equiprnent are cased by System C casings (see IS0 8866’) ).