We got this brush handle as a sample and fitted it with a 21 mm Super badger knot, the grip on this is outstanding for a metal brush, to me it sits nicely in hand with the middle finger and thumb on the knurled part, and index finger on the top smooth collar. If you like what you see let us know, and we will try and acquire some and offer them with various knots.
I am wondering if the core of the handle is weighted down, as it is surprisingly heavy at 97 grams. The handle is 30 mm on the knurling, 26 on the neck and 49 mm tall, the brush stands 105 mm high.