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Screw Sleeves - McMaster-Carr
Threaded Sleeves - McMaster-Carr
Amazon.com: Threaded Inserts - Threaded Inserts / Fasteners: …
Amazon.com: Threaded Sleeves
Sleeve Fasteners at Lowes.com
Guide for Selecting & Installing Threading Inserts
Threaded Inserts - Buy Threaded Inserts & Fasteners at Rockler
Screw Sleeve (322) - Walmart.com
Plastic End Caps & Screw Protectors - Lowe's
Threaded Inserts - Grainger Industrial Supply