hi guys i just got rims from friend

i have 97 honda accord v6

the rims is kg 690

i try my lug nut it didnt fit so i went to autoshop with no help from anyone there of course there was no one to ask for help.......i got lugs size 20*1.5 i try to install it but i guess it was short and not fit well inside the rims

so what size i should get and how long.........any help plz

thx for no answer i got it ........it is m12/1.5