3" Black Thin-wall Core Bit Marble / Granite / Limestone / Ceramics

Description

These black thin-wall core bits are excellent for drilling holes on porcelain tiles, ceramic tiles, marble, granite, quartz, and concrete.
The bit generally lasts 50-60 holes.
Must be used with plenty of water to avoid overheating.
Drilling Depth is 3 inches.
Fit standard angle grinders with 5/8"-11 threads.
Maximum spindle speed 3,000RPM.
Redress the bit frequently to keep it in good shape