Product Description

The Venom Dual Sink Hole & Drain Diamond Core Bit is a professional dual-function vacuum brazed diamond core bit designed for porcelain, quartz, granite, quartzite, Dekton, and natural stone.

This is a two-in-one tool that performs both operations with a single bit:

• Drills the hole

• Cuts the bevel with the same bit

By drilling the hole and creating the matching bevel in one continuous operation, this design eliminates switching tools, saving time and improving efficiency during installation work.

It is especially useful for:

• Sink drains

• Faucet holes

• Shower plumbing openings

• Countertop installations

How the Dual Function Works (Important Explanation)

Each Venom Dual Sink Hole & Drain Diamond Core Bit is built with two working diameters:

• The smaller inner diameter functions as the coring bit, drilling the hole

• The larger outer diameter functions as the beveling surface, creating the chamfer around the hole

As the bit drills through the material, the inner core cuts the hole first, and the outer diameter bevels the edge at the same time. This allows installers to complete both steps in one pass, producing a clean hole with a finished bevel without changing tools.

Use & Compatibility

• Can be used wet or dry, depending on your setup

• Water is recommended when possible to reduce heat and extend tool life

• Attaches using a 5/8-11 female thread, making it compatible with:

  • Polishers

  • Grinders

  • Air tools

Available Sizes (Dropdown Options)

Each dual bit is sold individually by size.

• 35 / 50 mm (Hole / Bevel)

• 40 / 60 mm

• 45 / 65 mm

• 50 / 70 mm

(The first number represents the hole size. The second number represents the bevel diameter.)

Primary Applications

• Sink drains

• Faucet openings

• Plumbing cutouts

• Shower holes

• Countertop openings

Works On

• Porcelain

• Quartz

• Granite

• Quartzite

• Dekton

• Natural stone

Thread Attachment

• 5/8-11 female thread

Compatible with most standard grinders, polishers, and air tools used in stone fabrication.

Key Features

• Dual-function diamond core drill bit

• Inner diameter drills the hole

• Outer diameter bevels the edge

• Single-layer vacuum brazed diamond construction

• Eliminates tool changes

• Saves time on sink drain and plumbing installations

• Sold individually by size

• Works wet or dry

• 5/8-11 female thread attachment