Model Number: AL-13-259 Key Specifications/Special Features: For the DSLR lenses parts, even we can do all support for our customers. Now the lenses parts include: lens barrel, lens cam barrel, spacer, rings, screw, multi threadKey features:Big dimension: outer-diameter:ф70.5xф67.8Thin wall ring type frame, less intensity.Milling out circle and surface, easily lead to part deforming.Anodizing and easily lead to part deformingDimension tolerance:0.019

Roundness: 0.019