The problem is that they are very thick, the smallest object I have ever seen is 7 mm in diameter - so for most lower knuckles they may be too thick.
Dhibaatadu waxay tahay inay aad u dhumuc weyn yihiin, sheyga ugu yar ee aan abid arko waa 7 mm oo dhexroor ah - sidaas darteed inta ugu badan ee jilbaha hoose waxaa laga yaabaa inay aad u dhumuc weyn yihiin.