BOSCH HDG11 11-Piece Diamond Hole Saw Assorted Set for Hard Materials for

The Bosch HDG11 11-Piece Diamond Hole Saw Set provides a dedicated cutting solution engineered for drilling into hard materials. Designed for trade professionals and serious DIYers tackling demanding surfaces, it bundles nine distinct hole saw sizes along with an innovative starter mechanism to eliminate common setup frustrations.

At the core of the set is vacuum-brazed diamond grit, which cuts quickly and provides longer working life than standard abrasive edges. Bosch also integrates segmented teeth around the rims to actively clear debris and manage heat buildup. Starting holes cleanly on slick, hard materials is streamlined by the AutoStart pilot bit, which features a spring-loaded, retractable shaft and a specialized grind that prevents bit walking without requiring a pre-drilled pilot hole.

Because this kit uses diamond grit and specialized cutting edges, it represents a more substantial investment than standard utility hole saws. Additionally, the product specifications do not list the exact shank dimensions or drill chuck compatibility for the included mandrel, so buyers will need to ensure their existing power tools accommodate standard arbor setups.

Verdict: The Bosch HDG11 set is an ideal choice for contractors and remodelers who frequently cut hard materials and need reliable, walk-free hole starting across nine versatile sizes.

• Brand: Bosch
• Model: HDG11
• Total Piece Count: 11 pieces
• Cutting Material: Vacuum-brazed diamond grit
• Design Feature: Segmented teeth
• Included Sizes: 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
• Included Accessories: 1 mandrel, 1 AutoStart pilot bit, 1 plastic case

A great fit if you:

• Need to cut clean holes in hard materials without predrilling pilot holes
• Want a full range of hole saw sizes from 1/4 inch up to 2-1/2 inches
• Require diamond grit cutting edges that clear debris and manage heat
• Prefer an all-in-one kit complete with mandrel and dedicated carrying case

Consider something else if you:

• Only need a single specific hole size rather than an 11-piece collection
• Prefer a budget bi-metal kit for standard soft materials

What hole saw sizes are included in this set?
The set includes nine hole saw cups: 1/4 inch, 5/16 inch, 3/8 inch, 5/8 inch, 1 inch, 1-3/8 inch, 2 inch, 2-1/4 inch, and 2-1/2 inch.

How does the AutoStart pilot bit work?
It features a unique grind and a spring-loaded, retractable shaft that allows you to start holes accurately and prevent bit walking without needing to predrill a pilot hole.

What accessories come with the hole saw cups?
Along with the nine hole saws, the kit includes one mandrel, one AutoStart pilot bit, and a plastic storage case.