This listing is for 10 piece/s.A bushing is also known as a bush is an independent plain bearing inserted into a housing to provide a bearing surface for rotary applications. This is the common form of a plain bearing. The common designs would include split, solid and clenched bushings. They are only a "sleeve" of material with an inner diameter, length and outer diameter They also help to constrain and restrain the motion of the parts. Sometimes, they are also known as a plain bearing. Bushings are used to line holes in stationary parts of a mechanism. They are particularly effective in spreading friction and wearing over the surface of the bushing as opposed to directing into a single spot. The main advantage of a bushing, as compared to a solid connection, is less noise and vibration are transmitted. Another advantage is that they require little to no lubrication. Specifications Diameter [Di] (Nom.): 30 Diameter [Do] (Nom.): 34 Wall Thickness [s3]: 1.970 +0/-0.035 Dimension [B]: 30 ±0.25 Shaft Diameter [DJ]: h8 30 +0/-0.033 Housing Diameter [DH]: H7 34 +0.025/-0 Bush I.D. when assembled in H7 Housing [Dia]: 30.06 +0.095/-0 Clearance [CD]: 0.06 +0.128/-0 Oil Hole [dL]: 6