Spherical contact surface automatically aligns nipple with the angle of spoke. 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, anodizedItem Specifications: Length: 15mm, Color: Black, Material: Brass, Package: 100/Count, Gauge: 14g,