Pacesetter® Drill Bit Systems can be used on ceramic, porcelain, marble and granite. Tungsten carbide grit cutting edge for faster and smoother cuts. Can be used with most types of electric hand drills (DO NOT use with hammer drills). Included drill guide and water cooling cup (use wet-only). Available in 5/16" and 1/4" drill bits. Additional 12PK replacement mounting tape available (G02004).