PENDULUM BOB BRASS 20mm DIA
Pendulum Bobs - various types.
25mmD brass, 20mmD brass, 20mmD steel, 20mmD plastic. 12mmD brass.
Each bob has a small hold drilled through and a larger hole counterbored on one side so a knot can be made in a string and the knot pulled up into the larger hole to be hidden and to be tamper-proof.