Countersunk bit for drilling crusher corners

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[burtonjeeplj]

So back when Poison Spyder had there big blowout 10 day sale on Pirate, I picked up a pair of crusher corners for my lj.  When I got them everything was fine except of the the bolt holes wasn't countersunken.  I bought a countersunk drill bit that was the biggest at the hardware store but it ended up being too small.  Any ideas of what size I would need?

[Axle]

something like this?
http://www.toolsforless.com/product/9059/Bosch_CST3_3_4_Countersink_Bit

[burtonjeeplj]

something like this?
http://www.toolsforless.com/product/9059/Bosch_CST3_3_4_Countersink_Bit

thats exactly it but I am not sure what size to use.  I am pretty sure the bolts are 3/8" but I am not sure what size will countersink the area around the hole

[Axle]

I measured my rock sliders, the counter sink is 3/4" in diameter. Drill the 3/8", then counter sink. Correct?

[burtonjeeplj]

ya its already drilled i just gotta countersink it, so i guess I should just pick up a 3/4 countersink bit and be done with it huh?

[burtonjeeplj]

okay so im going to order up a 3/4" countersink bit since i cant find any in the stores.  Thanks for checking for me Bob.

[Switch]

can't you just measure the bolt head?

[burtonjeeplj]

thats what bob did, Im at work so I cant but I wanted to order the drill bit while Im here a.k.a Im really lazy