The easiest way you can take care of your nails at home and save yourself a trip to the salon is by learning how to properly shape and file them yourself. Glass nail file is also called crystal nail file. Stainless steel nail file which is also called sapphire nail file, metal nail file or diamond nail file. Electric nail file is a new category with high technology. Nail buffer is also called nail buffers, nail buffer block, nail block buffer, buffing block or nail shiner block.