Hard Density Wheel Removes Challenging Burrs with Precision and Imparts a Fine PolishThe hardness of this wheel places it on the upper end of the spectrum of aggressiveness among Standard Abrasives™ Unitized Wheels. Given the coarseness of the mineral and greater material density, our Standard Abrasives™ Type 27 Unitized Wheel - 800 Series withstands high-pressure applications and cut aggressively. Use an 800 Series Unitized Wheel for deburring stainless steel pipe thread, wire edges from surgical instruments, stainless steel sinks, tanks and other equipment for the food service industry. It is a prime choice for deburring gears and aircraft wing spars, and breaking edges on aluminum extrusions. When it comes to polishing, trust an 800 Series Wheel to effectively polish stainless steel rule dies, welds on stainless steel sinks, machined surfaces, hand tools and round tubing.Choose the Right Wheel for Your Stock Removal ApplicationOur Standard Abrasives™ 800 Series includes three Type 27 Wheels:Wheel 811 Coarse grade aluminum oxide mineralHighest stock removal and edge breaking capabilityMost aggressive for deburringCapable of replacing 80 & 120 grit coated abrasive discsWheel 821Medium grade aluminum oxide mineralHigh stock removal, while maintaining disc life and productivityVery durable on an edgeCapable of replacing 100 & 120 grit coated abrasive discsWheel 822Medium grade silicon carbide mineralRapid stock removal, while providing a clean, bright surfaceMost effective on stainless steelHigh cut rate, with long lifeType 27 Fits 4-1/2˝ Right Angle GrinderA 4-1/2˝ Type 27 Wheel (sometimes called a Type 27 Disc) is designed to fit a right angle grinder with a wheel guard, typically used for fiber discs, flap discs, and grinding wheels. Type 27 Wheels have a depressed center to allow grinding at any angle without damaging the surrounding surface with the attachment nut, and are particularly useful for working on internal angles. These unitized wheels are used in conjunction with, and sometimes in lieu of, a coated abrasive resin fiber disc or flap disc. Standard center hole and quick change unitized wheels are also available in a range of sizes (sold separately).Non-Woven Unitized Construction Offers a Step Up in Density and Durability for Stubborn SurfacesStandard Abrasives™ Unitized Wheels are a great match for tough deburring, cleaning, blending and finishing applications. They come in a broad range of densities and grades to suit different metals, the degree of aggressiveness required, shape of the part and desired finish. Although used for some of the same tasks as Standard Abrasives™ Buff and Blend products, they are designed with a far stronger and denser construction to support more aggressive applications and accomplish material removal more rapidly. Even though unitized wheels are much stiffer products, the non-woven nylon fibers of the wheel maintain the advantage of responding to surface irregularities while preserving the geometry of the piece, and produce a consistent finish.Unitized wheels are created by starting with layers of open web material that combines non-woven fiber strands and abrasive mineral with a tough resin bond. These layers of web are then cured and compressed together. By fusing layers of open web, the abrasive gains more toughness and durability, so it can withstand repeated wear.Ultimately, the wheel's durability is what mak