Bottom Roller Characters: 
Manufactured by domestic the most advanced production line.
Adopt highest quality raw from domestic market.
Unique design of roller surface groove.
Unique roller heat treatment technique.
Accurate processing capacity.
Advanced inspection technique.

Quality Level：
Rate of non-mechanical wave reaches above 98%, maximum wave not exceed 5mm. 
Splicing two pieces of roller, testing run out static ≤0.04mm.
Tolerance of roller teeth width ≤0.04mm.
Roller already pre-installed bearing in plant and also has spliced interact.
No need of pre-straight before roller assembly to frame machine, may directly joint tightly.
Smooth surface without bur and wound.
Operation smoothly during long-term working, have good uniformity.