25/32 x 21 in SDS Max Rotary Hammer Drill Bit - Deep Concrete Drilling

In this review the 25/32 x 21 in SDS Max Rotary Hammer Drill Bit is evaluated as a purpose-built option for heavy masonry work. The bottom line: this long 540mm bit is for tradespeople and serious DIYers who need a long reach and an SDS Max connection to drive through concrete, brick and stone; its single biggest selling point is the combination of a 406mm effective drilling depth and a carbide tip that holds up to repeated percussion drilling. The review focuses on real use, durability and when this bit makes sense on the jobsite.

Key Features

• Length and reach: The 540mm total length with a 406mm drilling depth gives plenty of reach for deep holes in thick walls or footings.
• Robust shank: The SDS Max shank with an 18mm shank diameter provides a secure, professional connection for rotary hammer tools to reduce wobble during heavy drilling.
• Carbide tip: The plus-type carbide tip is designed to withstand repeated impact on concrete and brick, improving tip life and maintaining cutting performance.
• Alloy steel body: The alloy steel shaft balances toughness and resistance to bending during extended drilling tasks.
• Sized for common anchors: The 20mm (25/32 in) diameter suits medium anchor and dowel sizes used in masonry installations.
• Multi-material use: Built to perform in concrete, masonry, brick and natural stone for general construction and renovation work.

Who It's For

This drill bit is aimed at professional builders, masons and experienced DIYers who use rotary hammers with an SDS Max interface and need to bore deep holes into concrete, cinder block, brick or stone. The long 21 in length and 16 in effective depth are useful for through-wall anchor installation, deep sleeves for piping or electrical runs and other demanding tasks.

It is not the best choice for light occasional tasks or for users with small SDS Plus tools, since the SDS Max shank and long length are overkill for simple household drilling and require compatible equipment and some experience to use safely.

Pros & Cons

Pros

• Long 540mm length provides extended reach for deep holes and hard-to-access locations.
• SDS Max shank gives a solid, professional connection and reduces tool play under load.
• Carbide tip and alloy steel shaft resist wear and keep drilling performance consistent.
• Appropriate 20mm diameter for common masonry anchors and sleeves.

Cons

• Mixed customer feedback on tip strength suggests performance can vary with extreme conditions or very abrasive aggregate.
• Requires SDS Max hammer; not compatible with smaller SDS Plus tools.

Specifications

Diameter	20mm (25/32 in)
Total length	540mm (21 in)
Drilling depth	406mm (16 in)
Shank type	SDS Max (shank dia 18mm / 0.7 in)
Tip material	Plus-type carbide tip
Body material	Alloy steel

Our Verdict

The 25/32 x 21 in SDS Max rotary hammer bit is a practical choice for professionals and serious DIYers who need reliable deep drilling in masonry and concrete. It delivers strong reach, a secure SDS Max connection and a carbide tip that generally stands up to jobsite demands, making it good value when paired with a compatible rotary hammer and heavier workloads.

Frequently Asked Questions

Is this bit compatible with my rotary hammer?
The bit requires an SDS Max chuck; it will not fit SDS Plus tools, so verify your tool accepts SDS Max shanks.

How deep can it drill?
The total length is 540mm and the effective drilling depth is 406mm, allowing deep holes for anchors and sleeves.

What materials can it handle?
It is intended for concrete, masonry, brick and natural stone, using the carbide tip to resist wear under percussion drilling.