Diamond Core Drill Bit 102mm, 241mm Depth, M16, Adapters

Diamond dry core drill bit delivers clean, accurate 4-inch openings for fast installs in concrete and masonry. Designed for smooth, low-wobble drilling, it pairs a laser-welded diamond crown with a pilot drill for quick positioning—no pre-drilling needed. The included adapters expand compatibility with common drills and hammer drills, helping you cut precise holes for plumbing, HVAC, anchors, railings, and general construction work.

• Delivers smooth, burr-reduced cuts with precision-ground teeth for cleaner holes and faster progress.


• Includes pilot drill for accurate starts and stable tracking without switching tools mid-job.


• Fits most standard drills and hammer drills using 3 included adapters and an M16 internal thread.


• Resists heat and wear with carbon steel body and laser welding to help reduce segment detachment.


• Handles reinforced concrete, red brick, concrete, and foam brick for versatile jobsite drilling.

Built for contractors and serious DIY users who need repeatable hole quality, this 102 mm diamond coring bit set is a practical choice for everyday rough-in work. The centered tooth design helps keep the bit aligned with the axis to reduce shifting at high RPM, while the included wrench supports quick changes on site. Use it for AC line sets, pipe pass-throughs, conduit routes, and anchor points across renovation and new-build tasks. Grab yours today and keep the right diameter ready for the next install.

• Bit diameter: 4 in / 102 mm


• Max drilling depth: 9-1/2 in / 241 mm


• Overall dimensions: 10.94 x 4.02 x 4.02 in (278 x 102 x 102 mm)


• Thread: M16 internal


• Welding method: Laser welding


• Material: Carbon steel body with diamond segments


• Compatible materials: Reinforced concrete, concrete, red brick, foam brick


• Compatible machines: Drills, hammer drills


• Net weight (with accessories): 5.18 lb / 2.35 kg


• In the box: Core bit, 3 adapters, pilot drill, hex wrench