Package Content:7pcs in total; 5pcs Diamond drill bits 1″, 1-3/8″, 2″, 2-1/2″, 4″ (25/35/50/65/100mm), 1pc 1″ (25mm) Diamond Milling Bit, 1pc 5/8″-11 to SDS Shank Adapter Material Compatibility:Diamond drill bit set for Wet or Dry Drilling porcelain tile, granite, marble, stone, Masonry, brick. The 1″ diamond finger milling bit is for enlarging,shaping or Round Bevel Existing Holes Durable and Sturdy:Vacuum Brazed technology provides high efficient working performance, faster drilling speed and longer service life Recommended Machine:the drill bits are usually suitable for 5/8″-11 thread Angle Grinder. Recommended speed 6000RPM, maximum speed 11000RPM. Use electric drill: Recommended speed: 2000-5000RPM Conveniently:Aluminium portable suitcase for easy storage and portability.