Diamax Diamond Cone Grinding Bit – 1/4 in. to 1-3/8 in., for Porcelain & Ultra-Compact
Diamax Diamond Cone Grinding Bit – 1/4 in. to 1-3/8 in., for Porcelain & Ultra-Compact
The Diamax Diamond Cone Grinding Bit is a cone grinding bit tapering from 1/4 in. tip to 1-3/8 in. diameter for enlarging and shaping drilled holes in porcelain and ultra-compact material.
The cone tapers from a 1/4 in. tip to a 1-3/8 in. diameter, so a single bit opens a hole progressively to any size in that range. The 100 in the part number is the grit, not a diameter — reading it as a 1 in. tool is the common mistake.
Key Features
- Tapered cone, 1/4 in. tip to 1-3/8 in. diameter
- Fine 100 grit
- 5/8 in.-11 thread
- 3,000–4,000 RPM operating range
Not Recommended For
Not a drilling tool — it enlarges and shapes a hole that is already there. Start the hole with a core bit such as the Diamax Cyclone Ultra Core Bit – 1 in., for Dekton, Porcelain & Ultra-Compact.
Who Is This For?
Fabricators easing out faucet and fixture holes to fit, where redrilling is not an option.
Frequently Asked Questions
What size is this bit?
It tapers from a 1/4 in. tip to a 1-3/8 in. diameter. The 100 in the part number is the grit.
What grit is it?
It is the Fine 100 grit step of the ladder.
What speed should it run at?
Diamax publishes an operating range of 3,000–4,000 RPM.
What does it thread onto?
A 5/8 in.-11 thread — the standard grinder and polisher spindle.
Can I drill a new hole with it?
No — it opens and shapes an existing hole. Drill first with a core bit such as the Diamax Cyclone Ultra Core Bit – 1 in., for Dekton, Porcelain & Ultra-Compact.