Circular saw blades come in a variety of sizes, types, and tooth configurations, each of which is designed for specific types of cutting applications. The most common types of circular saw blades include:

1. Rip Blades: This type of blade has fewer teeth, typically 24 to 30, and is designed to cut along the length of the wood grain. It is ideal for making long, straight cuts in wood.
2. Crosscut Blades: This blade has more teeth, typically 60 to 80, and is designed to cut across the wood grain. It is ideal for making smooth, clean cuts in wood.
3. Combination Blades: This blade is a hybrid of the rip and crosscut blades, with 40 to 50 teeth that are evenly spaced. It is suitable for both ripping and crosscutting wood, as well as cutting other materials such as plastic and non-ferrous metals.
4. Dado Blades: This blade has two outer blades and a set of chippers in between, which allows it to make grooves or dados in wood. It is ideal for making precise cuts for joinery work.
5. Specialty Blades: This type of blade is designed for specific types of cutting applications, such as cutting metal or masonry. They may have special tooth configurations or be made of different materials than standard circular saw blades.

Circular saw blades are available in different sizes, which are typically measured by the diameter of the blade. Common sizes range from 4 inches to 12 inches, with larger blades being used for heavier-duty applications. It is important to select the right blade size and type for the material being cut and to maintain the blade properly by keeping it clean and sharp.

Here is a size chart for circular saw blades:

1. 4-1/2 inches: This size is typically used for small, handheld circular saws and is suitable for cutting thinner materials such as sheet metal, thin aluminum, and plastic.
2. 5-1/2 inches: This size is also commonly used for small, handheld circular saws and can be used to cut thicker materials than the 4-1/2 inch blade.
3. 6-1/2 inches: This size is commonly used for 7-1/4 inch circular saws and is suitable for cutting materials up to 2-1/2 inches thick.
4. 7-1/4 inches: This is the most common size for circular saw blades and can be used for a wide range of cutting applications, including cutting lumber, plywood, and other materials up to 3 inches thick.
5. 8-1/4 inches: This size is commonly used for 10 inch circular saws and can be used to cut materials up to 3-1/2 inches thick.
6. 10 inches: This size is commonly used for larger, stationary circular saws and is suitable for cutting thicker materials such as hardwood flooring, framing lumber, and other materials up to 4 inches thick.
7. 12 inches: This size is the largest commonly available circular saw blade and is suitable for heavy-duty cutting applications such as cutting thick lumber, beams, and other materials up to 6 inches thick.

Note that the specific sizes and applications of circular saw blades may vary depending on the manufacturer and intended use, and it is important to select the right size and type of blade for the material being cut and the type of cut being made. Additionally, it is important to properly maintain the blade by keeping it clean and sharp to ensure optimal performance and longevity.