A
kubotan, made from a floor lamp I saw in the bulk garbage. The lamp's foot was a stainless steel tube of 2 parts, already with threads.

Overall length is 133mm, weight is 64g (empty).

I cheated for the picture because the picks shown have a length of 120mm while the kubotan can only hold 110mm picks due to the stainless steel rods I fitted into the ends. I could have made it longer, but this is the length I wanted. Modifying the picks or making new ones isn't a problem though.
The grooves are not so much for grip but to conceal that it can be unscrewed.
