Authentic Bosun Circular Saw Blade Size and Teeth Available: 18″ x 30 & 40Teeth Model: WXZ450030L & WGZ450040L Hole Diameter: 30mm (1-3/16″) with 22mm (7/8″) and 25mm (1″) bushings Maximum R.P.M.: 1,800 Premium quality, professional grade, multipurpose blade High quality for faster cutting and longer lasting ISO9001 approved Application: For Wood