2026-08-19 · 9 min read
Heller Twinmax 3D Helix vs Diager Tri-Zone Helix: SDS Flute Geometry Compared
A catalogue-grounded comparison of Heller's Twinmax 3D Helix (constant twin-lead flute, used across the 2-cutter Bionic Pro and 4-cutter 4Power Pro) and Diager's Tri-Zone Helix (variable, zoned flute on the Twister Plus range) — why SDS flute-shape naming doesn't agree even within one brand's own catalogue, and how Zhonghuan assigns flute geometry per carbide head instead of reusing one flute across every SKU.
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