Linear Bearing Standard Linear Overall Height 1 7/8 in Overall Length 2 13/16 in Overall Width 4 in Housing Material Aluminum Mounting Hole Diameter 21/64 in Anodized Silver System of Measurement Inch 15 Series Double Flanged For Number of Slots 3 Standard Flange Thickness 3/8 in Pad Material UHMW Plastic Compatible Brand and Series 15 Series