knuckles or finger joints

when u have handwraps and gloves on and ur hitting heavy bag do u punch with ur knuckels or main finger joints

You punch with your hips and legs actually. ;)
Your knuckles are just taking the impact. ;)

Smart arse... :P

Think about it, throw a punch and try and just make your finger joints contact the surface you hit... does that feel right? ;)

Now make it so only your knuckles hit... bye bye wrist. ;) Hit with the whole entire fist, your knuckles, finger joints and everything inbetween :)

but when im hitting the bags it feels much easier with my finger joints but il try wit my whole fist

You musn't be punching properly then, you certaintly wont deliver any power hitting that way... ;)