Check the listing for details. 2 Pack 4.5" Diamond Segment Grinding Wheel Disc for Concrete Angle Grinders. Color: Blue, Condition: New. Listed at 59.00 USD. 2-Pack Premium 4-1/2 Inch Diamond Turbo Cup Wheel for Grinding Concrete and Masonry, 9 Segments, 5/8"-11 ThreadThe Super-Plus quality cup grinding wheel offers the best lifetime available on market 4.5" 4-1/2 inch 9 Segments Turbo Cup Wheel Good for general grinding/ stock removal 5/8"-11 Thread center arborPackaging: set of 2 piecesGrit: 30/40 Medium bond For wet or dry use. For use on angle grinders Large Grinding segments w/ heat treated steel bodies which provides increases durability and wheel life Diamond Bond: Soft Bond segments were designed to expose fresh diamond cutting edges more frequently than other bond types. This bond was designed for hard concretes such as those containing granite, quartz, and river stone. Medium Bond is a good all-purpose bond that balances cutting speed and tool life. This bond is suggested in most cases, it is good for medium concretes such as those containing pit gravel or crushed gravel. Hard Bond segments should be used for soft concretes such as those containing limestone, sandstone, or dolomite. Types of Grinding Discs Grit Ranges: #16 - #24 Grit: Very Coarse #30 - #40 Grit: Coarse #60 - #80 Grit: Medium. #100 - #120 Grit: Fine. # 150 grit and higher great for honing stones and jointing stones and other polishing abrasives Free Shipping & Returns: SAME business day shipping FREE 30-Day returns Contact us: Should you have any questions, please kindly contact us through eBay messaging service Click on the: "ask a seller a question" link on the listing page. We answer questions instantly. Thank you for shopping with DPT Diamond Tools!