https://www.tirodtactical.com/product-page/copy-of-fat-titanium-yawara-stick-with-fist-lock
"Hand Hammer" .685" Diameter Titanium Rod Yawara Stick With Fist-Lock™ | tirodtactical
Offered is ONE .685" Diameter "Patent Pending", Aerospace Grade 5 Titanium (6AL-4V Alloy), Easy-Carry, Ergonomic Firm Grip, Self Defense Yawara Stick. (aka...
yawara stickhandhammerdiametertitanium