Product characteristic:  Rotary damping coefficient small.  The radial direction beats low.  Revolves smooth.  Waterproof dustproof .  Leak-proof high.  Exempts maintains.  Life cycle long.  High accuracy supporting roller special-purpose steel pipe.  Steel plate ram as in ramjet bearing seat.  Big windage supporting roller special-purpose bearing.  Multiple labyrinth type polycarbonate seal.

Idler