The Rubi 52939 Half Bullnose is a precision-engineered grinder accessory designed to produce clean, half-rounded edges on the cut faces of ceramic, porcelain and natural stone tiles. Engineered in Spain by Rubi, a manufacturer whose tile-cutting tools are specified by professional tilers across Europe, this profile wheel turns an ordinary 115mm angle grinder into a controlled edge-profiling tool.

The half bullnose profile rounds one corner of the tile edge to a 90° radius — the standard detail used to finish exposed tile edges on shower returns, window reveals, step nosings and worktop transitions where a square edge would feel sharp and look unfinished. With patient passes and progressive pressure, the diamond profile shapes the tile face without the chipping or burn marks typical of free-hand grinding.

Designed for both wet and dry use, allowing tilers to flush dust on prolonged production runs or work dry for smaller on-site adjustments. The result is a manufactured-grade rounded edge produced on site, without the cost or lead time of factory-profiled tiles.

Key features

• Diamond-coated half bullnose profile for clean 90° rounded tile edges
• Designed for use with standard 115mm angle grinders
• Wet or dry cutting — flexible site use
• Suitable for porcelain, ceramic, marble, granite and natural stone
• Spanish-engineered Rubi quality — specified across the European tiling trade
• Produces factory-grade profiled edges on site without specialist machinery

Suitable for

• Finishing shower return and reveal edges in wetroom and bathroom installations
• Step nosings, threshold details and worktop transitions on tiled floors
• Window reveals and tile-to-tile transitions where a square edge isn't acceptable
• Bespoke profiling on natural stone, marble and granite tiles
• Trade tilers, stone fabricators and high-spec bathroom installers

For matching diamond cutting and profiling tooling, browse the full tile drill bits and blades range.