I bought a rabbeting bit on a whim today at Sears while shopping for a washing machine. Its not a huge purchase but on a tight budget I'm trying to make every purchase count. They had 3/8 and 1/2 to choose from. I didn't know what one to get and since I was on a limited budget (hadn't planned on even buying anything when I went in) I only got one. I took the 3/8 but now I'm wondering if I should have bought the 1/2 instead. What would you use the 3/8 rabbet for?? Any specific projects?? Is one more useful than the other??