12mm ID Linear Ball Bearing (21mm OD, 30mm Length) - 2 Pack

The bearing provides smooth and precise linear motion in mechanisms. High-carbon steel construction with a plastic cage and rubber seals ensures durability and minimal friction.

• Length: 30 mm
• Weight: 26.5 g each
• Material: High-carbon steel housing and balls, plastic cage, rubber seals
• Inner diameter: 12 mm
• Outer diameter: 21 mm

Ideal for 3D printers, CNCs, and other linear actuators, providing precise and reliable movement along guides.