This bearing has a tapered bore (inner diameter) 5mm from one side and 7mm from the other side, plastic pulley bearing

• Item: 5X25X6-2RS Ball Bearing
• Type: Deep Groove Ball Bearing
• Seals: Rubber Seals
• Size: 5mm x 25mm x 6mm
• Bearing Inner Diameter: 5mm from one side
• Bearing Inner Diameter: 7mm from the other side
• Bearing Outer Diameter: 25mm
• Bearing Width: 6mm
• Brand: VXB Bearing
• Quantity: One Bearing