For a 3/8 bolt, you should use a 3/8 drill bit.
For a 3/8 bolt, you should use a 5/16 drill bit.
For a 1/4 bolt, you should use a drill bit that is slightly smaller in diameter than the bolt itself. In this case, a 7/32 drill bit would be a good choice for drilling a hole for a 1/4 bolt.
For a 1/2 inch lag bolt, you should use a drill bit that is slightly smaller in diameter, typically a 7/16 inch drill bit. This allows for a snug fit and proper anchoring of the bolt.
For drilling into metal, you should use a cobalt drill bit.
For installing heavy-duty shelves in your garage, you should use a 3/8 inch lag bolt drill bit.
Your meaning is not clear. - If you are going to tap the threads in, use a 7/32 drill bit. If you want a hole that this bolt will slip through, use a 9/32 drill bit.
For drilling into a cement wall, you should use a masonry drill bit.
For drilling into a concrete wall, you should use a masonry drill bit.
The best type of drill bit for plexiglass is a carbide-tipped drill bit.
For drilling into tile, use a carbide-tipped masonry drill bit.
For hanging hooks, the best type of drill bit to use is a masonry drill bit.
For a clearance hole you need a 9/64 drill bit.