Bosch M45015 Review

When a standard SDS-plus bit hits its limit at around 16 or 20 mm in diameter, and the job calls for a 22 mm hole through reinforced concrete — for a heavy-duty anchor bolt, a plumbing sleeve, or a structural fixing — you step up to the SDS-max system. An SDS-max drill bit has a larger shank, deeper drive grooves, and a thicker body than its SDS-plus counterpart, allowing it to transfer more impact energy from the hammer to the cutting tip without twisting, snapping, or wearing out prematurely. For professional contractors and serious renovators who own an SDS-max rotary hammer, a good quality carbide-tipped bit is essential for the larger holes that SDS-plus tools simply cannot handle. A bit that stays sharp through hundreds of holes in hard concrete, clears dust efficiently to avoid binding, and centres accurately to prevent hole wander saves time and frustration on every job.

Hawera is a brand with a long history in concrete drilling accessories, having manufactured SDS-plus and SDS-max bits since 1952. Now part of the Bosch group, Hawera bits benefit from Bosch's carbide technology and manufacturing quality control. An SDS-max bit of this diameter — roughly 22 mm (7/8 inch) — sits in the medium-to-large range for handheld rotary hammers, suitable for anchor bolts, dowel fixings, and pipe pass-throughs. When selecting an SDS-max bit, the critical factors are the carbide tip quality, the flute design for dust clearance, and the overall length — which must be long enough to reach through the material you are drilling without the hammer body fouling against the wall.

This review covers the Hawera M45015, a 22 mm by 533 mm (7/8 inch by 21 inch) SDS-max carbide-tipped masonry drill bit rated 4.4 out of 5 stars from 42 customer reviews. We will look at its cutting performance, durability, and the professional applications where a bit of this size justifies its place in the tool bag.

This SDS-max bit features a tungsten carbide cutting tip brazed onto a hardened steel body measuring 22 mm in diameter and 533 mm in overall length — roughly 21 inches. The usable drilling depth is approximately 430 mm, giving you enough reach to drill all the way through a standard cavity wall, a foundation block, or a double-brick construction in a single pass. The carbide tip uses a centring point geometry that helps the bit start accurately without wandering across the surface, which is particularly important for large-diameter holes where even a small initial deviation becomes a significant positioning error by the time you reach full depth.

The bit body has a spiral flute design that serves two functions: it channels drilling dust up and out of the hole as the bit rotates, and it provides the mechanical pathway for the hammer's impact energy to travel from the shank to the tip. A well-designed flute clears dust efficiently enough that the bit does not bind, even in deep holes where the dust has a long way to travel to escape. The SDS-max shank has the characteristic four drive grooves that lock into the hammer chuck, providing both the rotary drive and the sliding freedom that allows the pneumatic hammer mechanism to strike the bit repeatedly without the shank bottoming out in the chuck.

In use, the bit is designed for rotary hammer mode only — it is not a core bit and does not leave a plug. It grinds the full 22 mm diameter, which means the hammer needs enough impact energy to overcome the material across the entire face area. This typically requires an SDS-max rotary hammer rated at 8 joules or more for efficient drilling in reinforced concrete. The carbide tip is formulated for hard concrete applications, including concrete with hard aggregate and light rebar, though hitting heavy reinforcement will accelerate wear on any carbide bit. A 45-degree cutting angle on the tip balances sharpness for fast penetration against durability for long service life.

The bit weighs approximately 0.9 kg (1.99 pounds), which adds meaningful mass to the hammer assembly and contributes to impact efficiency. It is manufactured by Hawera under the Bosch group and carries the quality expectations associated with German engineering standards. Customer feedback from 42 reviews averages 4.4 out of 5 stars, with users noting good durability in hard concrete and accurate centring. The bit is sold as a single unit and is compatible with any SDS-max rotary hammer from Bosch, Dewalt, Makita, Hilti, and other major manufacturers — the SDS-max standard is universal across brands.

At 533 mm long, this bit provides the reach needed for through-wall drilling in most residential and light commercial construction. For deeper applications — drilling through thick foundation walls or multiple layers of masonry — a longer bit may be needed. The bit is designed for concrete, reinforced concrete, brick, and natural stone. It is not intended for wood, metal, or any material where the hammer mechanism should be disengaged. For contractors who regularly install 20 mm and 22 mm anchor bolts, through-bolts, or chemical anchors, this bit represents a consumable that should deliver consistent performance over dozens or hundreds of holes before the carbide tip shows significant wear.

This SDS-max carbide-tipped drill bit is designed for professional contractors and serious renovators who need to drill 22 mm diameter holes through concrete, reinforced concrete, and masonry for heavy-duty anchors, structural fixings, and pipe sleeves.