Plain Back and Steel Back Type 11 Flaring cup wheels are commonly used in grinding and snagging operations, especially in foundries on right angle grinders for removing gates, risers and parting lines from castings. Type 11 Cup Wheels provide a large surface contact area, and are produced with a high amount of abrasive grain. This ensures high performance removal rates, especially on high power tools. PFERD range includes Aluminum Oxide, Silicon Carbide and Zirconia grain types. Choose Steel Back for added strength, durability and maximum safety in severe applications.