04-17-2014, 04:22 PM
More important than the bit type is that you use a drill guide like this one for drilling at 45 degrees:
They're about $50 at Home Depot, $20 at Harbor Freight.
A Forstner bit will give you a slightly cleaner hole but doesn't center as well as a spade bit. I'd probably just use the spade bits, which will work fine as long as you drill slowly and use the drill guide. You probably do not want to use the one with the screw on the front because you'll have to reverse every time you want to pull out.
They're about $50 at Home Depot, $20 at Harbor Freight.
A Forstner bit will give you a slightly cleaner hole but doesn't center as well as a spade bit. I'd probably just use the spade bits, which will work fine as long as you drill slowly and use the drill guide. You probably do not want to use the one with the screw on the front because you'll have to reverse every time you want to pull out.