Grinding wheels come in several types, each suited for different tasks:

• Straight wheels: Most common, used for surface grinding and cylindrical grinding.
• Depressed center wheels: Used for cutting and grinding metal with angle grinders.
• Cup wheels: Ideal for grinding flat surfaces and edges, often used on concrete and stone.

Choosing the right type depends on your project material and the tool you have.

Selecting the correct grinding wheel size is crucial for safety and performance. Here are some tips:

• Check your grinder's specifications for maximum wheel diameter and thickness.
• Match the arbor hole size of the wheel to your grinder's spindle for a secure fit.
• Consider the task: larger wheels cover more surface area but may be heavier; smaller wheels offer precision.

Always follow the tool manufacturer's guidelines to ensure compatibility and safe operation.

Grinding wheels and sanding discs serve different purposes despite some similarities:

• Grinding wheels: Made from abrasive grains bonded into a solid wheel, designed for heavy-duty material removal on metals, concrete, and stone.
• Sanding discs: Typically flexible, coated with abrasive grit, and used for smoothing surfaces like wood or light metal finishing.

Choosing between them depends on the material and the finish you want to achieve.