You gain Offensive Martial Arts and Defensive Martial Arts.
Your hands and other handy items count as weapons for the purposes of abilities that target or are delivered by them (although they cannot be shattered or destroyed). You may attack with them and their damage die is now 1d4.
Your hands and other handy body parts count as shields for the purposes of abilities that target them (although they cannot be shattered or destroyed). You may block with them and their BV is +1.
Note: This does not make your hands blocking.