Te-Y-Gb (Sds Max) Cruciform Drill Bell-shaped bit TE-Y GB 80/60 - 3 1/8"SDS Max (TE Y) cruciform hammer drill bit for larger diameter drilling into concrete and masonry Base material: Concrete, Masonry, Brick, Limestone Working mode: Hammer drilling Diameter: 66 mm Features Extreme durability brazed hard metal carbide tipped head means you can drill more with the same cruciform bit Fast, smooth drilling large helix engineered to efficiently transport dust away from the tip of the drill bit Easily replaceable helix you can