features:
Has good performances, low friction coefficients and long usage spans.
A linear reciprocating motion for a variety of mechanical systems, since the role of the support or drive, often with the support shaft, with the use of linear bearings.

Specification:
Material:Aluminum
Color:Silver
Product Size:60 x 51 x 20mm/2.36 x 2 x 0.78"
Inside Diameter:20mm/0.78"(Applicable to the optical axis diameter 20mm)

Pacakge:
4 x SK20 20mm CNC Linear Motion Ball Slide Units Rail Support Guide Shaft Bearing