This is the Race Face RIDE Crank Arm.

Features:

• CINCH Direct Mount Technology for easy 1x or any other configuration
• User-friendly versatility
• Forged 6066 aluminum
• Cro-Mo spindle provides extremely strong and stiff feel
• Does not include chainring
• Compatible with up to 51mm chainline

Product Specifications:

• Crank Arm Length: 170mm, 175mm
• Interface: 24mm
• Primary Color: Black
• Position: -
• BCD: Direct Mount Cinch
• Chainring Bolts: -
• Vendor Item No: CK19RID137ARM170BLK (Crank Arm Length 170mm), CK19RID137ARM175BLK (Crank Arm Length 175mm)