L H Dottie MD4XL Masonry Drill Bit 3/8x12 Inch

Product Description

The L H Dottie MD4XL is a masonry drill bit designed for boring through concrete, brick, block, and similar hard masonry materials. Sized at 3/8 inch in diameter and 12 inches in length, this bit provides the extended reach needed to drive anchors and fasteners in thick walls or deep embedment applications. The carbide-tipped cutting edge is the standard choice for masonry work, delivering clean, accurate holes without the need for pilot drilling. Licensed electricians, plumbers, and general contractors routinely reach for bits in this class when setting anchors, conduit straps, pipe hangers, and similar hardware in masonry construction.

This bit is well suited for residential and light commercial applications where anchor placement in poured concrete, CMU block, or brick is required. The 12-inch length is particularly useful when working through deep substrates or when a standard-length bit cannot reach the required embedment depth. Typical use cases include setting threaded rod anchors, drop-in anchors, and sleeve anchors for electrical, mechanical, and plumbing rough-in work.

Key Features

• 3/8 inch diameter for standard anchor and fastener hole sizing
• 12 inch length provides extended reach for deep embedment applications
• Carbide-tipped cutting edge suited for concrete, brick, and CMU block
• Single-piece per unit packaging for straightforward inventory management

Compatibility

Designed for use with standard rotary hammer and hammer drill chucks that accept 3/8 inch shank masonry bits. Confirm chuck compatibility before installation.

Installation Notes

Installation should be performed by a qualified tradesperson using a rotary hammer or hammer drill set to hammer-drill mode. Always wear eye protection and a dust mask when drilling masonry. Shut down any adjacent energized systems and verify no embedded conduit or rebar is present at the drill location before beginning. Follow applicable building and anchor manufacturer specifications for minimum edge distance and embedment depth.