Check the listing for details. 50x 4.5" 4-1/2 Zirconia Flap Grinding Wheels 120 Grit Angle Grinder Sanding Disc. Color: Blue, Condition: New. Listed at 55.99 USD. Features & Benefits of SATC Zirconia Flap Discs Self-Sharpening Fast Cut Rate Extended Life Operator Comfort Safety Guaranteed More Cutting Power than Aluminum Oxide Discs For Heavy Stock Removal and Aggressive Grinding 👍About the Structure of Flap Discs: 72pcs small 24x18mm cloth backing sanding discs are bonded tightly on the plate. The plate is constructed from 8 layers of fiberglass mesh and one layer of non-woven cloth. Metal rings are embedded on 2 sides 👍Self-Fracturing Zirconia Alumina Material: Premium zirconia alumina fractures frequently to continually produce fresh sharp points and deliver a faster cut-rate than aluminum oxide. Developed for heavy stock removal and high pressure grinding 👍Strong X-Weight Polyester Cotton Backing of Small Discs: Offering flexibility and well-suited for handling sharp edges and medium to high pressure applications 👍Resin over Resin Bonding: High strength resin bond system provides superior grain support, resist heat and humidity for longer life than usual resin over glue bond 👍Fiberglass Backing Plate: High quality special structure of 8-layer fiberglass mesh screen. Features extra strength, light weight, ability to absorb vibration, and operator comfort 👍More Resin Adhesive Added: Resin adhesive features heat resistance. More adhesive added to bond the small discs to the plate tightly to resist discs flying off when operating which helps achieving longer lifespan and ensuring security 👍Type 29 Shape: Best used at a 15~25 angle. Better for contouring and shaping surfaces, capable of more aggressive grinding than Type 27 Performs Well On Heat-resistant alloy steel, titanium alloy and authentic stainless steel, etc. Applications Contouring and shaping surfaces, heavy stock removal, aggressive grinding. Machines 4.5 inch Angle Grinders Specifications Color: Blue Dimension: 4.5 in Arbor Hole: 7/8 in Abrasive Material: Zirconia Alumina Coat Type: Closed Coat Backing Material: X-Weight Polyester Cotten Plate Material: Fiberglass Bond: Resin over Resin Application: Contouring and Shaping surfaces, Heavy Stock Removal, Aggressive Grinding Machine: 4.5" Right Angle Grinders MAX OPERATING SPEED RPM: 13,300 Grit: 120 Quantity: 50 Pack Do wear the proper personal protective equipment (PPE). Required PPE is safety glasses along with goggles or a face shield. Wear other PPE as needed, such as gloves, dust mask, apron, etc. Shipped same-day from Houston via USPS Priority Mail, UPS Surepost or UPS Ground, the shipment method depends on the quantity and your address.