what screws to use to mount box to truck ? ( no flat or phillips head screws )

[big scott]

hi guys,

well yesterday i put 4 l-brackets on my box and its screwed to the floor. well all i had are some ss screws so i used them but they are phillips head and i dont like that as anybody can unbolt it.

so im looking for a sheet metal screw that i can use with some different type of head so its not so easy to take out ?

what do you guys use ?

im mainly doing this for security so nobody steals it.

needs to be self taping as i cannot get to under the box, my gas tank is there or i would bolt it down.

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[whitedragon551 5,000+ posts]

https://www.parts-express.com/8-x-1-black-screw-button-head-security-hex--260-842