This Supertech titanium retainer set is specified for Honda H1003S series valve springs and the K20C application, supplied as a set of 16 retainers with a 7-degree design. The listing identifies these as titanium retainers for that spring series and engine family, intended for valvetrain builds where those specific spring and engine matches are required.
Supertech Titanium Retainer for Honda H1003S Series Springs - 7 Degree - K20C - Set of 16