Our Screw Back Hardware is machined from solid brass. Use to create a screw back attachment on items. Ex. Conchos, Coins, Medals, etc... Simply attach the screw back (post) onto the item's back and fasten as desired using one of our matching thread Chicago Screws. We recommend using only on items with a metal mounting surface. Soldering is highly recommended but there may be other alternate solutions such as epoxies. These Screw Backs are available in our Standard 13/63" (5.2MM) diameter or our Mini 5/32" (4MM) diameter. Need something with an even smaller diameter? Contact us! We stock a few select lengths in two smaller diameters (1/8" & 3/32"). 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 10+, 50+, 100+, 500+ & More. Click item to see pricing. If you are unsure if our Screw Back Hardware is a right fit for you, try our Screw Back Sample Kit first.