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Each bearing is double-shielded (ZZ) to keep out dust and dirt
KBF8UU NB Bearing 8mm Ball Bushings Linear Motion Bearing made for smooth installs and steady fit
It comes pre-greased and sealed
These sealed bearings are handy for RC cars because they reduce friction
Oil Seal TC 16x21x6mm - TC Double Lip NBR Rubber Oil Seal with Garter Spring 5209 Each bearing is double-shielded (ZZ)The TC16x21x6 is a double lip rotary shaft seal, block out dirt & lock in grease or oil. Designed for a shaft diameter of 16mm Width 6mm, with a bore diameter 21mm Nitrile Rubber Lip Material. Item Sku : TC16x21x6 Type : Oil and Grease Seal TC 16x21x6 mm Shaft diameter (inner): 16mm Housing bore (outer): 21mm Width : 6mm Size : 16mm x 21mm x 6mm Oil and Grease Seal Material : Nitrile Butadiene Rubber Temperature Range : 40 to 248F Ideal for both
