Parts of a Circular Saw Blade - York Saw and Knife
Circular saw blade buying guide
Bosch 1x Circular Saw Blade Standard (for Wood, Ø 150 x 2.2/1.5 x 20/16 mm, 40 Teeth, ATB, with 1x Reduction ring 16 mm, Accessories for Circular Saws) : Amazon.co.uk: DIY & Tools