1:00
I7 · 28 mm
Gray granite
2026-07-11View evidence
Product geometry test program
2-Cutter (Single Carbide Tip) · I7 Geometry
Zhonghuan's profiled 2-cutter architecture, drilled on camera in hard granite. One shaped carbide tip forms two cutting edges and a centering point: it starts where you put it, tracks straight, and keeps the bore clear.
Product
Zhonghuan SDS-Max 28 mm 2-Cutter I7 Drill Bit
Internal code
DP1-I7
Diameter / shank
28 mm / SDS-Max
Evidence in topic
2 substrate videos
I7 head architecture
2-Cutter (Single Carbide Tip) · I7 Geometry
Zhonghuan's profiled 2-cutter architecture, drilled on camera in hard granite. One shaped carbide tip forms two cutting edges and a centering point: it starts where you put it, tracks straight, and keeps the bore clear.
1 carbide tip2 cutting edgesCentering point
Our own development testing
≈50%
faster drilling
≈40%
longer service life
Measured in our own development testing against Zhonghuan's earlier flat 2-cutter head, same hammer and same stone.
SDS-Max · I7
Drilling records by substrate
2 videos
These records show how the featured geometry drills granite. Send your target substrate, diameter and working depth and we will arrange a sample evaluation for your project.
Evaluate I7
Review the SDS-Max range, or ask for I7 samples and run them on your own stone.