1-1/4 in. Brazed diamond drilling core bit with 5/8 in. arbor. Suitable for using your angle grinder for dry cutting of porcelain tile, ceramic tile, marble, granite, masonry, cement, limestone, slate, terracotta, fiberglass and travertine. Long life and durable. DTA has been serving the Tile and contractor market for over 40 years. Quality is our reputation.