Michigan Drill 240 1/2x3/8 4 flute end mill.  Cut diameter is 1/2" with a 3/8" shank.  Length of cut is 1" , and overall length is 2-3/4".  These are not US made, I don't believe.  Price per end mill is $9.99ea. 

Shipping for US customers will be $4.35 for First Class Mail, which includes delivery confirmation. 

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