Products Description Part No.30412207-11 Bit Diameter: 30-41mm Size: Hex. 22mm, 25mm Taper degree: 4°46′, 6°, 7°, 11°, 12° Website:www.maxdrillrocktools.com Applications: Quarrying, small hole drilling Our tapered bits include button, cross and chisel designs. Longer service life and lower drilling costs. 11°, 12° tapered button bit with hot zinc-coating