AttributesOuter Diameter177.3 mm (6.98 inch)Inner Diameter87.7 mm (3.45 inch)Length380.5 mm (14.98 inch)Overall Length393.2 mm (15.48 inch)Bolt Hole Diameter15 mm (0.59 inch)Efficiency99.9Efficiency Test StdISO 5011TypePrimaryStyleRoundMedia TypeCellulose