Spear-headed tungsten carbide-tipped drill with 6mm (1/4″) hex shank. For clean, accurate holes in ceramic tiles, glass and mirrors. Low drill pressure and frequent lubrication optimises results. Spear-headed tungsten carbide-tipped drill with 6mm (1/4″) hex shank. For clean, accurate holes in ceramic tiles, glass and mirrors. Low drill pressure and frequent lubrication optimises results.