Shaft Support Block Bolt Size 1/4 in Finish Unfinished Flange Width 1.25 in For Use With Thomson 60 Case(R)LinearRace(R) Shafting Material Aluminum Alloy Mounting Hole Center to Center Distance 2.125 in Mounting Hole Dia (mm) 0.27 in Nominal Inside Diameter 1 in Number of Mounting Holes 4 Overall Height (In.) 2.75 in Series Type FSB Flanged System of Measurement Inch Top Length 2.75 in Type Flanged End Support Block