Strong hooks. They do exactly what I needed - I bought them to screw into my porch poles to hang small lanterns made from glass jars, dried beans and battery operated tea lights. Although the packaging says it's self-tapping, I couldn't insert it into machined 4x4 racks without first drilling a pilot hole about 1/2" deep. When things got bad, I stuck a screwdriver in the hook section and used it like a t-handle to turn the screw.no signs of stretching or slipping.
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