I got a shield on my Warrior that I bought for 50k

Will it increase my Critical when I hit with my sword? I have Crit 7 on my sword so that means I got 42% chance of hitting a critical?
or How does it work? xD
Also I saw this sword that has Crit 35 So would it increase my shiled' BR from 11 to 46%? o.O I didn't buy it because I was plannign to buy a 5D sword instead of a 4D.
So is this how it works or Am I wrong?

Edit: This might be a stupid question but a friend told me (when I recently started) the number after crit was the % for example CRIT 10 = 10% chance of critical :o