Machinable Mounting Block Bolt Size 1/4 In.-20 Finish Black Anodized Flange Length 3.25 in Flange Thickness 0.38 in Flange Width 1 in For Use With Square Profile Shafts Hex Profile Shafts Round Shafts up to 1 in Dia Material Aluminum Mounting Hole Center to Center Distance 1.34 in Mounting Hole Dia (mm) 0.28 in Mounting Surface to Shaft Center (In.) 1.5 in Number of Mounting Holes 2 Overall Height (In.) 2.19 in Series SBLB System of Measurement Inch Top Length 1.94 in