Features: - Convex triangular cross-section design. - Optimal spiral notch angle. - Guided cutting force-free tip. - Scientific sequence design. - Strong center positioning ability. - Length: 25 mm. Pack contains: - 1 x Orifice opener 17/08. - 1 x 20/04. - 1 x 25/04. - 1 x 30/04. - 1 x 35/04.