Skateboard hardware is used to connect the skateboard trucks to the skateboard deck. Skateboard hardware refers to the bolts and locknuts used when building a board. The bolts can have an Allen or Phillips head. Skateboard hardware comes in many different lengths, and often includes one different colored bolt so that the rider can mark the nose of their board.
To get higher ollies, I would suggesting resting your back foot on the very end of the tail and the front foot in the middle of the deck to allow for more slide. Popping as hard as you can and catching your board in the groove of the nose with you ankle practically resting in the groove will level the board out in the air. after this initial movement slide you feet back to the bolts on the tail and nose to ensure a clean landing.