Sterling Silver .041" Threaded Earring Back - Pack of 6 Master Alloys This SWS model (147

This SWS model (147

Includes multiple filter pieces in two distinct sizes to address different filtration points within the machine

Because thermoplastics do not adhere directly to metal surfaces

Apply testing acid (sold separately) across the streak

From Alan Revere:

Sterling Silver .041" Threaded Earring Back - Pack of 6 Master Alloys This SWS model (147Keep earring sets secure with these sterling silver threaded earring backs from WR Cobb. Designed to fit a standard . 041" (1. 04mm) diameter post, these clutch style backs feature a threaded mechanism for a reliable, adjustable hold. With a 5. 75mm outside diameter, they provide a comfortable fit and confident support for a wide range of earring styles. Sold in a pack of 6, they are well suited for bench production, repair work, or retail resale.