Diamond Hole Saw Assorted Set 11-Piece - Fast Wet Cutting

In this review the Bosch HDG11 11-piece diamond hole saw set is judged as a specialist accessory for anyone cutting hard materials like porcelain, granite or glass mosaic. The bottom line: this set is worth buying for its vacuum-brazed diamond grit that improves cut speed and life under wet cutting conditions, plus the convenient Quick Change system and AutoStart pilot bit that make accurate starts with less fuss. It is designed only for use with machines set up for wet sawing and on a protected circuit, so it targets shop and trade use rather than dry handheld drilling.

Key Features

• Vacuum-brazed diamond grit: delivers faster cutting and longer blade life when used with water cooling on hard surfaces.
• Segmented teeth: reduce debris buildup and heat during cuts to help maintain cutting performance in dense materials.
• AutoStart pilot bit: spring-loaded design starts holes accurately and reduces wandering on glazed tiles and stone.
• Retractable shaft: allows walk-free cutting without pre-drilling a pilot hole for quicker setup on repetitive holes.
• Quick Change system: the universal mandrel swaps sizes in seconds so a single drill setup handles the full range of holes.
• Plastic case included: keeps the assortment organized and protected between jobs and on the truck.

Who It's For

This set is best for tile installers, stone fabricators, contractors and advanced DIYers who frequently cut porcelain, ceramic and natural stone and who use wet sawing equipment on a GFCI-protected circuit. It suits jobs where precise, splash-cooled cutting matters and where changing hole saw sizes quickly saves time.

It is less suitable for casual users who only occasionally drill soft wood or metal, or for dry drilling applications, since the saws require wet sawing machines and water cooling to perform as intended and to protect the diamond bond.

Pros & Cons

Pros

• Cuts faster and lasts longer on hard materials thanks to vacuum-brazed diamond grit.
• AutoStart pilot bit and retractable shaft improve accuracy and reduce the need for pilot holes.
• Segmented tooth design helps control heat and debris when used with water cooling.
• Comprehensive size range in a single plastic case for convenience on site.

Cons

• Durability is mixed in user reports; some users note wear or breakage after a few uses on very abrasive materials.
• Not usable for dry drilling or with equipment that lacks wet sawing capability and GFCI protection.

Specifications

Brand	BOSCH
Set pieces	11-piece assortment with mandrel and AutoStart pilot bit
Hole sizes included	1/4 in, 5/16 in, 3/8 in, 5/8 in, 1 in, 1-3/8 in, 2 in, 2-1/4 in, 2-1/2 in
Cutting technology	Vacuum-brazed diamond grit with segmented teeth
Special features	AutoStart pilot bit, retractable shaft, Quick Change system
Case	Plastic carrying case
Intended use	Wet sawing only on GFCI-protected circuit

Our Verdict

For tradespeople and serious DIYers who regularly cut porcelain, tile or stone, this 11-piece diamond hole saw set offers strong value through fast cutting, accurate starts and a practical range of sizes in one case. It represents a good investment provided it is used with proper wet sawing equipment and water cooling; occasional users who lack wet cutting gear should look for a different, dry-use solution.

Frequently Asked Questions

Can these hole saws be used dry?
No. They are intended for use with machines designed for wet sawing and require water cooling and a GFCI-protected circuit.

Does the set include a mandrel and pilot bit?
Yes. The set includes one mandrel and an AutoStart pilot bit with a spring-loaded, retractable shaft.

What materials will these cut well?
They are designed for hard materials such as porcelain, granite and glass mosaic tiles when used with proper wet cutting.