HCS 60T 4-1/2" 4.5 inch Metal Plastic Circular Saw Blade for Rockwell Rk3441k, Worx WX429L 9.5mm/ 3/8" arbor RW9282 Pack of 1 4-/1/2" 60T HCS Diamond Circular Saw Blade for Rockwell, Worx Use for wood, plastic, aluminum, metal and drywall Material HCS High Carbon Steel w/ carbide tip Fits with Rockwell/ Worx 4/1/2" Arbor size: 3/8"