3M Sof-Lex Discs Pop-On Mandrels RA (3) A latch attachment, pop-on mandrel for use with Sof-Lex Contouring and Polishing Discs and Sof-Lex Extra-Thin Contouring and Polishing Discs. > Low-profile mandrel design reduces risk of marring the restoration for easier use and improved results > Easy to use Suggested Applications > Finishing and polishing composite, ceramic and glass ionomer dental restorations