Our Screw Back Hardware is machined from solid brass. Use to create a screw back attachment on items. Simply attach the screw back (post) onto the item's back and fasten as desired using one of our Chicago Screws. We recommend using only on items with a back metal mounting surface. Soldering is highly recommended. These Screw Backs are available in our standard 13/63" (5.2MM) diameter or our mini 5/32" (4MM) diameter. For high volume pricing, smaller diameters or any questions, please contact us. Size on product title refers to length. Please click on each item for detailed dimensions. Price breaks available at 50+, 100+, 500+ & More. Click item to see pricing.