MATERIAL QUALITY: Made of premium aluminum alloy, lightweight, high strength, and deformation resistance, durable for long-term use. CRANK ARM LENGTH: 170mm crank arm length with no overlap between the crank arm and chainring bolt. PERFECT CUTTING: Standard precision cutting of holes ensures compatibility with bikes and easy installation. SPINDLE INTERFACE TYPE: Horizontal Square Taper. Please verify that the orientation of your right crank is compatible. Ensure both left and right crank arms have matching hole configurations. SUITABLE FOR: Road bikes, mountain bikes, folding bikes, fixed gear bicycles, and other compatible models. MATERIAL: Aluminum alloy COLOR: Black PACKAGE CONTENTS: 1 pair x bicycle crank arms Note: The package includes only the items listed above; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by up to +/- 1-3 cm.