Jungong Diamond Coated Hole Saw Bit | Electroplated Emery Core Drill for Glass, Tile, Acrylic & Rigid Plastic (6mm - 90mm) - Atradesen

Jungong Premium Diamond-Coated Hole Saw Core Drill Bits (6mm - 90mm)

Drill clean, smooth, and chip-free holes in brittle and hard materials with our premium Jungong diamond-coated core drill bits, available at Atradesen.com. Manufactured in Shanghai, these high-performance hole saws feature a heavy-duty nickel-plated carbon steel body with electroplated industrial diamond grit (emery) on the cutting crown.

Designed to be mounted easily on standard handheld electric drills, impact drivers, or bench drills, this professional series offers a highly durable solution for cutting precision holes in glass, ceramic tiles, and rigid synthetic sheets.

Perfect for Brittle & Hard Materials

Specifically optimized for producing clean, circular holes in highly challenging, non-metallic substrates, including:

• Glass panels, mirrors, and glass vessels.
• Ceramic tiles, porcelain, vitreous china, and clay pottery.
• Acrylic sheets, plexiglass, fiberglass, and rigid PVC/UPVC plastics.

⚠️ Critical Water Cooling & Operating Guidelines

To ensure a clean cut and extend the lifespan of the diamond coating, please strictly adhere to these professional guidelines during operation:

• Continuous Water Lubrication: You must add water continuously to cool and lubricate the cutting edge while drilling. Dry drilling will generate extreme heat, immediately burning off the diamond grit and rendering the bit useless.
• Starting at an Angle (No Pilot Pin): Because these core bits do not have a center pilot drill, they can slip or skate initially. To start, hold the drill at a 45-degree angle to create a shallow crescent groove, then slowly bring the drill perpendicular to the flat surface.
• Gentle, Light Pressure: Apply light, gentle down-pressure. Do not force or push the drill. Keep a steady, shake-free grip, especially when breaking through the bottom layer of glass to prevent cracking.

Technical Specifications

Frequently Asked Questions (FAQ)

Q: Why is continuous water cooling mandatory for these diamond hole saws?

A: Industrial diamonds are electroplated onto a steel substrate. Friction from drilling glass or ceramic tiles generates intense localized heat. If water is not continuously applied to cool the bit, the steel crown will expand and release the electroplated diamond particles, ruining the bit in seconds.

Q: How do I keep the hole saw from sliding when I start drilling?

A: Since there is no center pilot pin, start by tilting your drill at a 45-degree angle. Let only one side of the circular diamond edge contact the glass/tile to grind a small moon-shaped groove. Once this crescent groove is deep enough to act as a guide, slowly pivot the drill back to a 90-degree perpendicular position and continue drilling.