Item Type: Ball Bearing Model: 635Z Inner Diameter: Approx. 5mm / 0.2in Outer Diameter: Approx. 19mm / 0.75in Thickness: Approx. 6mm / 0.24in Feature: High Speed Roller Column Number: Single Column Raceway Type: Deep Groove Raceway Bearing Material: Bearing Steel Roller Type: Ball Sealing Cover: Double sided sealing Rolling Body: Steel Ball Package List 10 x Ball Bearings 1HIGH SPEED: The protective cover on both sides of the ball bearing can prevent dust from entering, suitable for high speed running equipments. 2BEARING STEEL: Made of excellent bearing steel material, which has high hardness and strength, rustproof and wear resistant, with long service life. 3DOUBLE SHIELDED: These deep groove ball bearings are double shielded sealing design which can avoid the ingress of contaminants and saves lubricant. 4STANDARD SIZE: The inner diameter is 5mm, the outer diameter is 19mm, and the thickness is 6mm, with standard size, easy to install and replace. 5WIDE APPLICATION: Including 10pcs ball bearings, widely used in industrial machinery, drilling mining equipment, cutting machine, winding machine, etc.