Surly MDS Chips: 12mm Thru-Axle Dropout, Alloy, Shimano Direct mount hanger, Pair 

Surly MDS Dropouts chips. Made of cast and machined 6061-T6 aluminum or stainless steel, and available in multiple configurations.

• 12mm thru-axle
• Compatible with Shimano direct mount derailleurs only
• Aluminum