Seven 0.22 inch mounting holes in the base; the ball is made of nitrile rubber
NSN 5920-01-283-2611
NSN 6110-01-406-3623
NSN 6135-01-658-3265
NSN 5965-00-422-5415
NSN 5975-00-817-4476
NSN 5945-01-460-7778
NSN 5915-01-157-9799
NSN 6610-00-237-6154
NSN 5920-01-605-3232
NSN 5999-01-563-7527
NSN 5935-01-492-4440
NSN 6135-00-548-2765