Spyder diamond hole saws are the professional choice for hole-making in tile, glass and masonry materials. Premium boron coated industrial diamond abrasive self-sharpens for quick cuts and long - up to 20 times more holes than standard diamond hole saws and up to 10x faster than standard glass and tile bits. A high temperature nickel braze adheres at temperatures up to 1.5x the braze temperature used on standard diamond hole saws, therefore increasing diamond abrasive retention and saw life. Oversized core removal slot enables easy side evacuation of the core, without tools or prying (for materials with a depth of up to 5/8 inch). A 1/4-in speed hex won't slip in the chuck. Heavy duty single piece construction and vacuum furnace heat treated high-alloy steel provides a reliable cut and consistent, round holes. These saws can be used wet or dry, water spray or immersion will increase tool life, reduce dust and debris, and will create a more quiet cut. Spyder's diamond hole saws are for use on ceramic, porcelain, granite, slate, marble, glass, cement fibre board, laminates and more; with a 1-1/8-in total depth of cut. Made in the USA.