The bolt on the left is a 1/4-24 and the one in the center is a 1/2-20 bolt.
The bolt that was torqued is on the right, which was a 3/8-16. This was torqued to 45 FT LBS (Foot Pounds)
Tapping, Drilling, Torqueing GIFS
Tapping GIF
Drilling GIF
Torqueing