a. External spherical ball bearing with seat b. External spherical ball bearing with vertical seat c. Outer spherical bearing with square seat d. External spherical ball bearing with diamond seat e. External spherical ball bearing with convex seat f. Outer spherical ball bearing with annular seat g. External spherical ball bearing with slider seat h. External spherical ball bearing with suspended seat i. External spherical ball bearing with hanging seat j. External spherical ball bearing with adjustable diamond seat k. Outer spherical ball bearing with stamping seat