BLUEROCK® BLOCK 3.5" Diamond Core Drill Start Guide Kit – Concrete Centering Template with SDS Drill Bit & Reusable Anchors
Brand : BLUEROCK TOOLS
- SKU:
- BR-Block 3.5"
- UPC:
- 789091583905
- Availability:
- IN STOCK – Ships Same Business Day (Order by 2PM Pacific / 5PM Eastern)
- Weight:
- 5.00 LBS
- Shipping:
- FREE USA Shipping | Express Available
Professional Centering Template for Diamond Core Drills
The BLUEROCK® BLOCK is a patented reusable centering guide that virtually eliminates core bit walking when starting a 3.5" diamond core drill hole. Designed for professional contractors and serious DIY users, the BLUEROCK BLOCK allows you to start holes accurately on concrete, masonry, and other hard surfaces with confidence.
The kit anchors securely to the concrete using the included reusable concrete screw anchors, creating a rigid guide that keeps the core bit perfectly centered during the most critical stage of drilling. Once the core bit has established its groove, simply remove the guide and continue drilling normally.
Unlike homemade plywood templates or freehand starting methods, the BLUEROCK BLOCK provides fast setup, repeatable accuracy, and professional results while reducing unnecessary wear on expensive diamond core bits.
Manufactured from durable engineering-grade plastic, the BLUEROCK BLOCK is designed for repeated use on commercial job sites.
BLUEROCK BLOCK™ — No Walk. No Wander.™
Features
- Designed specifically for 3.5" (88.9 mm) diamond core drill bits
- Virtually eliminates core bit walking during startup
- Improves hole placement accuracy
- Reduces startup time
- Helps extend diamond core bit life
- Durable reusable engineering plastic construction
- Fast installation using included reusable concrete screw anchors
- Compatible with most handheld and rig-mounted diamond core drills
- Patented design
- Made in New Zealand
Complete Kit Includes
- (1) BLUEROCK BLOCK 3.5" Core Drill Start Guide
- (2) Reusable 10 mm Concrete Screw Anchors
- (1) 10 mm SDS-Plus Masonry Drill Bit
- (1) 17 mm 1/2" Drive Installation Socket
Everything needed to begin using the BLUEROCK BLOCK is included in the package.
How It Works
- Drill a 10 mm pilot hole to a minimum depth of 30 mm using the included SDS-Plus drill bit.
- Remove all dust and debris from the hole.
- Install the included 17 mm socket onto a 1/2" drive impact wrench (medium torque setting recommended).
- Insert one of the reusable concrete screw anchors through the center of the BLUEROCK BLOCK.
- Tighten the anchor until the block is securely fastened to the concrete. Do not overtighten.
- Slide your 3.5" diamond core drill bit over the guide and begin drilling.
- Once the core bit has established its groove, remove the BLUEROCK BLOCK and continue coring normally.
Typical Applications
- Plumbing pipe penetrations
- Electrical conduit installations
- HVAC openings
- Mechanical anchors
- Concrete coring
- Commercial construction
- Residential construction
- Concrete renovation projects
Specifications
| Specification | Details |
|---|---|
| Brand | BLUEROCK Tools |
| Model | BLUEROCK BLOCK |
| Hole Size | 3.5" (88.9 mm) |
| Pilot Hole Size | 10 mm |
| Minimum Anchor Depth | 30 mm |
| Anchor Drive Size | 17 mm |
| Socket Drive | 1/2" Square Drive |
| Block Material | Engineering Plastic |
| Country of Manufacture | New Zealand |
| Patent | US Patent 11,203,071 |
Why Choose the BLUEROCK BLOCK?
Starting a large diamond core bit accurately can be one of the most difficult parts of the drilling process. The BLUEROCK BLOCK provides a simple, reusable solution that improves precision, saves time, and helps protect expensive core bits. Whether you're drilling a single plumbing penetration or multiple holes on a commercial job site, the BLUEROCK BLOCK delivers professional, repeatable results every time.
BLUEROCK BLOCK™ — No Walk. No Wander.™
