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Discovering the perfect combination of sharpness, speed, and smooth finish, we proudly present our premium-grade, smooth-cutting stones dedicated to shaping the ejection port roll-over notch of 1911 Auto slides. We searched far and wide until we found these top-quality stones that deliver hardness, speed, and precision. Utilize the B51 stone to fashion either the short or long style notch, then complete the job with the B42 stone to obtain a deep long style notch. The cobalt impregnated aluminum oxide stones rapidly slice through the metal and leave a polished surface that's ready for bead-blasting or polishing. The stones are durable, reusable, and can be resharpened. The hardened steel shanks are long-lasting and feature a nickel-plated finishing that maintains its concentricity, even following continuous use.