The set includes an EF mount ring, an adaption ring with support bracket, Torx screws, eleven color coded shims and a rear lens cap. As the flange focal distance varies from camera type to camera type, it is sometimes necessary to make adjustments when changing the lens mount or camera model. In order to perform this adjustment, shims in eleven different thicknesses are provided. ZEISS strongly recommends the use of a Torx T6 torque wrench with a torque of 0.4 Nm.