Wieland bur, VHF zirconia bur, manual operation bur, ZZZ bur Wieland bur, VHF zirconia bur, manual operation bur, ZZZ bur The photos and ... holder diameter is more than h6. Helical angle: 0°,25°,30°,35°,45°,50°,55°,60° Cold-hard machining replacing grinding ... realize high efficiency application. Wieland bur, VHF zirconia bur, manual operation bur, ZZZ bur