Linear Bearing Standard Linear Overall Height 50.1 mm Overall Length 75.1 mm Overall Width 143.4 mm Housing Material Aluminum Mounting Hole Diameter 8.3 mm Anodized Silver System of Measurement Metric 40 Series Double Flanged For Number of Slots 4 Standard Flange Thickness 9 mm Pad Material UHMW Plastic Compatible Brand and Series 40 Series