Round Washer Head Square Drive screws look like a Pan Head screw with a washer built right under the head. This large bearing area makes them perfect for hanging cabinets, or fastening down thin materials. When using slotted holes to provide for wood movement, the large flat under the head will let the screw snug up while still allowing for desired slippage. Un-plated,dry lube finish. Made in USA /Canada/Taiwan. #2 Combo Recess.