Safe and Efficient Material: CNC machining integration, high-quality 7075 aluminum alloy for a lighter weight and safer strength. Long Time Cycling: Slot inlay design for easy installation, suitable for long-term cycling. Crankset Size: Crank arm length 170/175mm, spindle 24mm, weight 674g. Spindle Interface Type: GXP direct mount structure. 2023 New Design BUCKLOS Crank Set: High-end products at affordable prices.