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The BSC PREFERRED QJDIB-MB-020 is a 1/4-inch rotary percussion masonry drill bit designed for use in both rotary and hammer drills. The carbide tip delivers clean, accurate penetration into hard masonry substrates including brick, block, and concrete. An exact-point start geometry reduces walking at contact, allowing the bit to seat quickly and drill straight without pre-marking. At 0.06 pounds, this is a lightweight, single-use-class bit suited for everyday masonry work on the job site. Licensed tradespeople and experienced contractors reach for bits like this when setting anchors, running conduit through masonry walls, or drilling pilot holes in block foundations.
This bit is suited for residential and light commercial masonry applications where consistent, repeatable hole placement is required. It performs in standard rotary drills and SDS-compatible hammer drills when used with the appropriate chuck adapter. Typical installation scenarios include anchor setting in poured concrete, drilling through CMU block for sleeve anchors, and general-purpose masonry boring in renovation and new construction environments.
Designed as a standard 1/4-inch rotary percussion masonry bit compatible with rotary drills and hammer drills equipped with a standard keyed or keyless chuck.
This bit is typically installed by general contractors, electricians, plumbers, and HVAC technicians when penetrating masonry substrates. Confirm the drill is set to hammer mode for best performance in concrete and block. Wear appropriate eye and respiratory protection when drilling masonry, as fine silica dust is generated. Do not use in SDS-only chucks without a proper reducing adapter.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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