Description: – , stop puncture – Quick knockdown High Grade alloy and material, durable for use. – Heavy duty, wear-resistant, smooth, silence. – Perfect for most manual front wheel, walking aids. – Ball bearings using in all joints, brings loading capacity and long working – Come with screws, easy to install and removed. Specification: – Material: Alloy – Size: Approx. 17cm 6.7 inch – Bearing Diameter: approx. 0.8cm (5 16 inch) Package Includes: 1 Piece Wheels Replacement Note: Please allow 1-2cm(0.4-0.8 inch) size difference due to measurement. Thank you!. High Grade alloy and material, durable for use. Perfect for most manual front wheel, walking aids. heavy duty, wear-resistant, smooth, silence. , stop puncture. Quick knockdown.