This Mondraker 21.85mm wide x 10mm hardware needle bearing kit answers the question, "How do I use your needle bearing kit with the 10mm hardware on my Summum or Durham?" The NBKMON10X2185 kits include all new hardware and adapters (one kit required for each end of the shock) to convert from DU bushings to our needle bearing kit. The 2010-2012 Summum and Durham frames use the Mondraker "Zero Suspension" system which means that there is significant rotation within both shock eyelets. For this reason, we recommend 2 (two) kits per frame.