1-9/16 x 21 in SDS Max Rotary Hammer Drill Bit - Heavy Duty Masonry

In this review the 1-9/16 x 21 in SDS Max rotary hammer drill bit is evaluated for contractors and serious DIYers who need a long, large-diameter masonry bit for deep anchor and through-drill work. The bottom line: it is a straightforward heavy-duty concrete bit that delivers reliable drilling performance in brick, stone and concrete because of its 40mm diameter, long 540mm length and a hardened carbide tip that holds up under rotary hammer use. For jobs that require deep holes in masonry the bit's 406mm drilling depth and SDS Max shank make it a clear choice.

Key Features

• 40mm diameter: The large 1-9/16 in cutting diameter creates oversize holes for heavy anchors and through-bolts without multiple passes.
• 540mm total length: At 21 in overall length the bit reaches well through thick walls and deep fixtures, reducing the need for extensions.
• 406mm drilling depth: A practical effective depth of about 16 in lets users place deep anchors or run conduit through concrete and block walls.
• SDS Max shank: The SDS Max 18mm shank ensures a secure fit in compatible rotary hammers and smooth transfer of impact energy for faster progress.
• Carbide tip: The hardened carbide tip and alloy steel body resist wear when drilling abrasive masonry and extend useful life on jobsite tasks.
• Masonry focus: Designed specifically for brick, stone, cement wall and concrete work so it performs well on common construction materials.

Who It's For

This drill bit is best suited to professional tradespeople and experienced DIYers who regularly drill large-diameter holes in concrete, block, brick or stone. Its SDS Max shank and long reach make it a practical choice for rotary hammer users who install heavy anchors, through-bolts or sleeves in structural material.

It is less appropriate for users who only need occasional small-diameter holes or who own a small SDS Plus hammer; those users should look for smaller diameter bits or shorter lengths. Also, it is intended for masonry work and not for wood or metal drilling applications.

Pros & Cons

Pros

• Large 40mm diameter creates holes for heavy anchoring and utility runs in one pass.
• Long 540mm length and 406mm drilling depth reduce the need for extensions on deep work.
• SDS Max 18mm shank offers a secure, impact-ready connection for compatible rotary hammers.
• Carbide tip and alloy steel construction deliver durability for abrasive masonry surfaces.

Cons

• Mixed customer notes on tip strength suggest occasional variability in durability under heavy use.
• Designed specifically for SDS Max hammers, so it will not fit SDS Plus or standard drill chucks without adapters.

Specifications

Diameter	40mm (1-9/16 in)
Total length	540mm (21 in)
Drilling depth	406mm (16 in)
Shank type	SDS Max (shank dia 18mm / 0.7 in)
Tip material	Carbide tip
Body material	Alloy steel
Applications	Masonry, brick, stone, concrete, cement wall

Our Verdict

For contractors and experienced DIY users who need a long, large-diameter masonry bit the 1-9/16 x 21 in SDS Max offers good value through its combination of reach, drilling depth and a carbide tip that stands up to routine concrete work. It is a practical choice when paired with an SDS Max rotary hammer, delivering reliable hole production for anchors and through-bolts while avoiding the hassle of multiple smaller passes.

Frequently Asked Questions

Will this bit fit my rotary hammer?
It fits rotary hammers that accept an SDS Max shank (18mm); it will not fit SDS Plus or standard chucks without an adapter.

What materials can it drill?
It is built for masonry: concrete, brick, stone and cement walls using a rotary hammer in hammer-drill mode.

How deep can I drill with one pass?
The effective drilling depth is about 406mm (16 in), which is the practical maximum depth for a single pass.