Specification Brand : uxcell BulletPoint1 : Battery Included: No; Product Name: Ball Transfer Unit BulletPoint2 : Material: Metal; Ball Diameter: 16mm/0.63" BulletPoint3 : Total Size: 49 x 32 x 21mm/1.93" x 1.26" x 0.83"(L*W*H); Color: Silver Tone BulletPoint4 : Net Weight: 325g; Package Content: 8 pcs x Ball Transfer Unit BulletPoint5 : Hole Size: 4 x 38mm/0.16" x 1.5"(D*Centre Distance) ExternallyAssignedProductIdentifier1 : 602451614692 ExternallyAssignedProductIdentifier2 : 0602451614692 ItemName : uxcell 8 Pcs 16mm Dia Metal Ball Transfer Bearing Unit Casters Universal Wheel ItemPackageDimensions_Height : 14.7 centimeters ItemPackageDimensions_Length : 3.8 centimeters ItemPackageDimensions_Width : 11.2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : ball-transfers Manufacturer : uxcell Material : Metal ModelNumber : a16031800ux1873 NumberOfItems : 8 PartNumber : a16031800ux1873 ProductDescription : Description: Features a 360 degree swivel mounting plate attached to a double wheel roller system. Ball Transfer Unit is perfect replacement for your broken one on your office chair.