• Shimano Road BB-UN72 English-Thread Cartridge Sealed Bearing Bottom bracket. Out of box. 
• Square taper axle.
• English threads, fits 73mm bb shells, double Road/MTB cranks and has a 107mm axle.
• Made in Japan quality from 1999.
• 9.9oz./280 grams.
• BB631.
• FREE shipping in the USA.