【Dog Bone Wrench】 For enthusiasts, collectors, or as a DIY tool, how about adding this to your collection? ■ 8 holes, 8-15mm ■ Total length: Approximately 222mm ■ Weight: Approximately 340g ■ "TOKYO ASAI.SEI" and "PATENT 162749" are embossed. ※ Believed to be 8 holes, 8-15mm. As this is a very old tool from the Showa era, there are no size markings. The measurements were taken with calipers, so please consider them as a guideline. ※ The wrench part rotates without issue when pressed with a finger, but the rotation of the smaller box is slightly less smooth than the larger side (though it should not affect use). ※ I am not an expert, so please understand that I cannot provide detailed information. ※ This is a very old and rare tool. Please check the images for the condition and understand that it is a used item before purchasing. ※ Please check the item upon receipt from the delivery company and contact me on the same day to confirm receipt. ※ Currently listed as cash on delivery, but I can change it to include shipping if you contact me. In that case, the selling price will be the current price plus the Mercari shipping fee. Also, there are some areas where Eco Mercari shipping is available for up to 160 size at a low price of 730 yen, so if you are in an eligible area, I will ship via Eco Mercari. Please let me know in the comment section before purchasing.