This is a drawing of one of the hand weights I made after a back injury, so I could do the recommended excercises for strengthening my stomach muscles, at work. I don't use them anymore but have held onto them. I made them out of bits and pieces lying around the workshop during one morning tea break! There is large allthread in the middle with a stainless steel sleeve as the handgrip. Many large washers together as the weights and a large nut each end to keep it all together and add to the weight. They weigh about 700gms each.