Seven 0.22 inch mounting holes in the base; the ball is made of nitrile rubber
NSN 6220-01-351-6686
NSN 6645-01-112-6373
NSN 6105-00-761-1290
NSN 5999-00-078-2621
NSN 5945-01-151-7893
NSN 5910-01-399-0255
NSN 5996-01-549-3032
NSN 6650-01-443-5342
NSN 6685-00-068-0933
NSN 6110-00-562-3363
NSN 4140-01-012-3996
NSN 5905-01-273-0913