Gives clean, accurate cut. Use on fibreglass, cast iron, ceramic tile and marble. Longer life than bi-metal blades when cutting abrasive materials like MDF and chipboard. Use with variable drill at slow speed. Use arbor with TCT pilot drill. Do not use hammer action. Arbor sold separately. For 20/25mm use (Quote 10531). For other sizes, use (Quote 10770). Specifications: Width 25mm.