Offer Valid: 7/1/10 - 9/30/10 Buy 12 Scalers, Get 1 Dual Grit Sharpening Stone Free! To receive your free good(s) please send a copy of your Patterson invoice indicating the required purchases and your free good(s) selection to: 3232 N. Rockwell St. Chicago, IL 60618-5935 or fax to:773-868-3560. Redemption must be post marked by 10/31/10. Free good(s) must be of equal or lesser value. May not be combined with any other offer.