The 'C' clasp is fabricated in 0.8mm stainless steel wire and should engage the undercut on the tooth. N.B. - The looped end is smoothed slightly with a rubber bur prior to bending.

The 'C' clasp shown here as part of the construction
 of a lower twin block for anterior retention.

The 'C' clasp shown here on a molar tooth, with a different 'retentive tag'.