Vertical pillow block、 bearing is built in、 but without shaft Bore diameter of bearing: 8mm、 can hold 8mm shafts Inner diameter of mounting holes: 5mm、 use M5 screws Vertical type、 inner diameter: 8mm、 length: 55mm、 thickness: 13mm、 height: 30mm、 distance between mounting holes: 42mm Dimensions: 2.17 in x 1.14 in x 0.51 in (5.5 cm x 2.9 cm x 1.3 cm) Weight: 1.31 oz (37 g)