the present invention relates to medical and veterinarian rotary tools . in particular , the present invention relates to a rotary tool for the taking of biopsies and drilling into tissues such as nail and bone . more particularly , the present invention relates to nail care devices and procedures to improve the condition of nails , especially relating to the treatment of fungal infections . onychomycosis is a fungal infection that causes the toenails and / or fingernails to thicken , discolour , and split . onychomycosis can result in permanent nail deformity . the disease can have a significant impact on a patient &# 39 ; s quality of life arising from psychosocial issues e . g ., due to concern regarding the appearance of one &# 39 ; s toenails and fingernails , and may cause pain associated with wearing shoes . the present invention seeks to provide an improved mechanical system for use in the treatment of onychomycosis and other nail bed conditions , and other animal keratin , bone and cartilaginous conditions .