Used twice. Threads are clean. I bought this new, driven by a desire to disassemble a mama-chari (Japanese commuter bike). The enthusiasm quickly faded, and it's been left unused for several years... I hope someone can use it. Reference: https://www.amazon.co.jp/ホーザン-HOZAN-ボトムブラケットツール-インターナルタイプ20溝用-C-207/dp/B00L3UUARO/ref=asc_df_B00L3UUARO?mcid=229d0e11b8a3398499e40d6dbe20426f&th=1&psc=1&tag=jpgo-22&linkCode=df0&hvadid=707456524065&hvpos=&hvnetw=g&hvrand=4885976120528280060&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9197664&hvtargid=pla-439451340667&psc=1&hvocijid=4885976120528280060-B00L3UUARO-&hvexpln=0