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