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Products JLC' s Products by Dave Crosby Removable Concrete Anchors This concrete fastener is supposed to eliminate the need for threaded sleeve inserts by combining the vibration resistance and strength of adhesive anchoring technology with the convenience of expansion anchors. Once the adhesive around a full-thread Chem-Bolt has cured, a release agent allows the fastener to be tightened or removed. Available in grade 2 or grade 5 carbon steel and 304 stainless steel, the bolts come in 1/4-, 3/8-, 1/2-, and 3/4-inch diameters, in lengths from 11/2 inches to 10 inches. Retail price is comparable to threaded-rod and epoxy systems, ranging from 20¢ to $2 per bolt. Contact: Powers Fastening, 2 Powers Square, New Rochelle, NY 10801; 914/235-6300; www.powers.com. Light Your Site Here is a weatherproof