Attachment to your stick is up to you. I've seen people drill a smaller hole in from the side with a screw into the wood. I drill a larger screw in from the top, through the pommel, into the end of the shaft. You can just epoxy the heck out of it.
Inside hole is 3/4" diameter. Knob is 2" diameter. Weight: 6.5oz Material: Chrome Brass Knob