Since the link is a multi-attribute product, please be careful to choose the product size that suits you. 10PCS/Set 608RS 8*22*7 mm Bearing ABEC-5 Skateboard Scooter 608 2RS Ball Bearing Miniature 693ZZ Roller Ball Bearings Kit FAQ: What Is a 608 bearing? The most common standardized ball bearing size is the 608 series. The 608 series is the original standard ball bearing. In the 608 series, the ball bearing typically consists of optional closures, inner race, outer race, balls, and a ball retainer. The ABEC rating is graded in five tiers of 1, 3, 5, 7, and 9 ratings, where the higher the rating, the tighter the tolerances of the bearing. Ball bearings that have a high ABEC system rating are used for high precision applications such as the aerospace industry or surgical equipment, and lower ABEC graded ball bearings are used for more everyday bearing applications. ABEC ratings also reflect the relative prices of ball bearings; the higher the grading, the more expensive the ball bearings. Size: 608ZZ 8 x 22 x 7mm Specification: Material: Bearing Steel Size: Inner diameter: 8mm Outer diameter: 22mm Thickness: 7mm Quantity:10pcs 608-2RS 8 x 22 x 7mm Bearing Specifications (Metric) Bearing Type: Sealed Bore Dia (d): 8.000 mm Outer Dia (D): 22.000 mm Width (B): 7.000 mm Radius (min) (rs): 0.30 mm Dynamic Load Rating (Cr): 2,799 N Static Load Rating (Cor): 1,103 N Max. Shaft Shoulder Dia. Inner (Ui): 10.5 mm Min. Housing Shoulder Dia., Outer (Uo): 19.03 mm Ball Qty: 7 Ball Dia (Dw): 3.969 mm Precision: ABEC-5 Standard Clearance: C0/(K25) Material: 52100 Chrome Steel 693ZZ 3 x 8 x 4mm Specifications: Material: Bearing steel Inner Diameter: 3mm / 0.12" Outer Diameter: 8mm / 0.31" Thickness: 4mm / 0.15" Quantity: 10pcs 684ZZ 4 x 9 x 4mm Descriptions: Bearing type: Shielded Bore Dia (d): 4.000 mm Outer Dia (D): 9.000 mm Width (B): 4.000 mm Radius (min) (rs): 0.10 mm Dynamic load rating (Cr): 545 N Static load rating (Cor): 182 N Max. shaft shoulder dia. inner (Ui): 5.2 mm Min. housing shoulder dia., Outer (Uo): 8.1 mm Ball dia (Dw): 1.588 mm Weight (g): 1.0 grams Precision: ABEC-5 Standard clearance: C0/(K25) 688ZZ 8 x 16 x 5mm Descriptions: 10PCS 688zz metal sealed bearings Inner diameter/Bore=8mm Outer diameter=16mm Width/Height/thickness=5mm 623ZZ 3 x 10 x 4mm Descriptions: Item: 623ZZ ABEC-5 EMQ Z3V3 Type: Deep groove ball bearing Material: Carbon Steel Closures: 2 Shield, can't be removed and re-installed again Dimensions: 3mm x 10mm x4mm ID (inner diameter)/Bore: 3mm OD (outer diameter): 10mm Width/Height/thickness: 4mm Quantity: 10OPCS 625ZZ 5 x 16 x 5mm Specifications: Model: 625ZZ Material: Chrome Steel Color: Gray Size: 5mmx16mmx5mm Inner Diameter: 5mm Outer Diameter: 16mm Thickness: 5mm Suitable For: 3D printer Quantity: 1 Set (10Pcs) (other accessories demo in the picture is not included) 624ZZ 4 x 13 x 5mm Specifications: Material: Chrome Steel Color: Gray Size: 624ZZ 4mmx13mmx5mm 4mm 13mm 5mm Suitable For: 3D printer 626ZZ 6 x 19 x 6mm Specification: Material: Carbon Steel Type: 626ZZ Color: Silver(Shown as pictures) Inner Dia: Approx. 6mm/0.23inch Outer Dia: Approx. 19mm/0.74inch Thickness: Approx. 6mm/0.23inch Quantity: 10 Pcs 685ZZ 5 x 11 x 5mm Specifications: Material: Bearing steel Inner Diameter: 5mm / 0.19" Outer Diameter: 11mm / 0.43" Thickness: 5mm / 0.19" Quantity: 10pcs 608RS ABEC-5 Specifications: Material: Titanium,Stainless Steel Size: 0.83 x 0.83 x 0.27in/2.1 x 2.1 x 0.7cm (L x W x H) Color: Red Quantity: 10Pcs Features: 100% brand new and high quality. Deep groove ball bearings. These bearings are pre-lubricated with grease. Selection of metal material, good quality, long life. Smooth operation, low friction, high performance and long life. Applications: skateboards, roller blade, inline skating, scooter, rollerblade. Please confirm it is the correct size the bearing you are looking for. Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Packing Included: 1 x 10P cs Bearing _x000D_