Product Description Function: Bearing Unit No.: KP004 (Bearing No.: K004, Apartment No.: P004, Bore diameter: 20 mm) Chrome steel insert, plain bearing, long life and low noise Two pillow block bearing bolts mounted. Zinc alloy housing, rust and durable Self-aligning bearing can correct its own alignment once it begins to rotate Designed for mounting on surfaces parallel to the shaft axisPackage Includes:KP004 Bearing - Zinc/Chrome Steel Locking Screws with 20mm Diameter Hole (2pcs) Highlights: 1. The product size is manually measured, there may be errors 2. Since different monitors display different colors, please refer to the actual color you received. 3.Please confirm the size before purchasing.