- Spherical contact surface automatically aligns nipple with the angle of spoke - ProLock: pre-prepped/treated nipple threads with special compound - Squorx Pro Head design is excellent for building/truing at nipple head, 15mm overall length with a 12mm wheel building calculator dimension - PHR washer use is necessary if used with '1' series rims - Aluminum: forged, machined nipple with full length threading, anodized
