6pcs Diamond Drill Bits Set, Extended Diamond Vacuum Brazed, 3/16 1/4 5/16

The CenfeiTooL 6-Piece Diamond Drill Bit Set is designed for drilling clean holes through tough masonry and brittle surfaces. Made for use with standard electric hand drills, it helps installers and DIYers tackle hard tiling jobs without cracking delicate workpieces.

A major convenience of this set is its dry-drilling design. Each core bit contains an internal cooling wax that absorbs heat during operation, removing the hassle of setting up a continuous water feed. The bits feature a 34mm diamond grinding surface permanently fused to a carbon steel body through vacuum brazing, which resists heat buildup and prevents premature grit loss during high-friction cuts.

To solve the common issue of bits wandering across slick surfaces, the package includes a dedicated carbide pilot drill for starting your holes accurately. The bits connect via a 1/4-inch hex shank, allowing quick changes in compatible drill chucks. The five core bit sizes (3/16, 1/4, 5/16, 3/8, and 1/2 inch) cover common diameters needed for fasteners and small plumbing fixtures in porcelain, ceramic, granite, and quartz.

Because this set focuses on five specific core diameters up to 1/2 inch, projects requiring wider openings or specialized non-masonry drilling will need separate tooling. The listing also does not mention an included storage case, so you will need your own pouch or organizer to keep the six pieces together.

Verdict: This set is an excellent choice for anyone who needs to install fixtures into porcelain, granite, or ceramic tile. The built-in wax cooling and included pilot bit make it a reliable, mess-free option for precise dry drilling.

• Piece Count: 6 pieces (5 diamond core bits, 1 carbide pilot drill)
• Core Bit Sizes: 3/16", 1/4", 5/16", 3/8", 1/2"
• Shank Size: 1/4" hex shank
• Diamond Surface Width: 34mm
• Body Material: Carbon steel with brazed diamond layer
• Cooling Method: Internal cooling wax
• Compatible Materials: Ceramic tile, porcelain, granite, quartz

A great fit if you:

• Need to drill clean holes into porcelain, ceramic, quartz, or granite
• Prefer dry drilling without spraying water over your workspace
• Use standard electric hand drills with 1/4-inch hex chucks
• Want a pilot bit to prevent drill slippage when starting holes

Consider something else if you:

• Need hole diameters larger than 1/2 inch
• Are drilling through materials other than hard masonry and tile

Do I need to use water while drilling?
No, each bit is filled with internal cooling wax to dissipate heat, allowing for clean dry drilling without external water.

What materials can these bits cut?
They are engineered for hard and brittle surfaces including ceramic tile, porcelain, granite, and quartz.

What sizes are included in this set?
The set comes with five diamond core bits (3/16", 1/4", 5/16", 3/8", and 1/2") and one carbide pilot drill.

What type of drill shank do these bits have?
All bits feature a standard 1/4-inch hex shank compatible with most electric hand drills.