- Alps2Ocean Diamond-Crank 89 mm crank arms, made from forged 6061 aluminum alloy for maximum strength and durability - Diamond hole design, compatible with square taper spindle interface - Black sand finish, resistant to corrosion and wear - Includes two crank arms (left and right), both marked for easy installation - Suitable for electric bikes, MTB, city, folding, road, and stationary bikes - Ideal for replacement or upgrade of components in drivetrain systems - Complete package with mounting bolts included - Compatible with mid-drive motors and standard bicycle systems - Recommended to check length and compatibility before installation - Robust, lightweight, and easy-to-install product for demanding cyclists