Pillow Block Linear Ball Bearing IPPSN32G 2" ID Open - Self Aligning, Lubrication PortLinear ball bearing pillow block, open shelled, with a 2" inner diameter (ID) self aligning bearing inside an aluminum alloy housing with a lubrication port called a "grease zerk fitting" on the side. Interchangeable with industry standards, this bearing has a low coefficient of friction, a heat treated alloy steel shell for durability, and a resin retainer polymer cage to reduce noise. Grease zerk fitting lubrication port on the side Temperature