9mm?应该是最流行的口径啊!怎么会买不到?

http://www.amazon.com/s/ref=nb_*****_ss_i_2_7?url=search-alias%3Daps&field-keywords=9mm%20hex%20bit&sprefix=9mm+hex%2Caps%2C291

http://www.amazon.com/Lisle-33960-9mm-Brake-Caliper/dp/B005ADY968/ref=sr_1_1?ie=UTF8&qid=1402494493&sr=8-1&keywords=9mm+hex+bit

http://www.amazon.com/Titan-15609-Drive-Hex-Socket/dp/B004W8046G/ref=sr_1_2?ie=UTF8&qid=1402494493&sr=8-2&keywords=9mm+hex+bit