Odyssey O-WORKS Genuine Putter Weights, 20g x 2 Set, Used. Diameter is approximately 20mm. Includes only two 20g weights and the case. The 10g weights and wrench that came with the original set are not included. Installation can be done with a standard golf wrench, often called a "kachakacha" wrench. Shipping will be via Yu-Pocket Post Mini. Please note that this will be delivered to your mailbox.