SPECIFICATAION: Features: Ideal for beveling, smoothing, shaping, excellent performance. Application: pplied for dry or wet grinding. Perfect for concrete granite, marble, concrete products, masonry material, and all types of natural stone. Machinery: Angle grinder WHY CHOOSE US? 1. Equipped with two sliver rings, suit for both 7/8, and 5/8 grinder. 2. Have more air holes than others, working longer 3. Double Row: Perform twice as the single row counterpart 4. Larger 5mm segment height for more aggressiveness 5. Strong and sturdy material, designed for fast and smooth grinding 6. Easy to install and operate. 7. Use dry/wet to smooth concrete or fieldstone. WHAT YOU WILL GET? 1* 4-1/2 Inch Double Row Grinding Wheel 1*4 Inch 12 Segs Heavy Duty Angle Grinder Wheels 2* Silver Ring