• CNC machined 6061 aluminum
• Black anodized finish
• Attaches to frame with (1) M3x10 Socket Head Screw
• Fastener Included
• For 12x1.0 Thru Axle (Double Lead)
• Replaces Cannondale Part #K33009

Note: DROPOUT-399 is for M12x1 double lead threaded axles (Cannondale Speed Release). For regular M12x1 thru axles, use DROPOUT-303.