BIHUI Diamond Countersink Bits — Sit Hardware Flush in Tile and Stone A bolt head or anchor standing proud of a finished tile face looks unfinished and gets in the way. BIHUI diamond countersink bits taper and recess a pre-drilled hole so hardware sits flush or recessed in porcelain, ceramic, and natural stone — the clean detail that separates pro work from a rushed install. They come in multiple diameters to match your fixtures and anchors, run wet or dry with standard power tools, and the diamond surfaces cut cleanly to leave a smooth, chip-free recess. For a full range of shaping bits, see the Diamond Milling Bit Set. Why Tile Pros Choose It Flush hardware: Recesses fasteners and anchors below the tile face Clean cut: Diamond surfaces taper holes without chipping Size to the fixture: Multiple diameters to match your hardware For tile and stone: Porcelain, ceramic, and natural stone Wet or dry: Works with standard power tools Pro tip: Drill the pilot hole first, then countersink with light pressure and water to keep the edge clean — forcing the taper is what chips the rim. Match the countersink diameter to the hardware so it seats without slop.
