The RYOBI Wing Nut/Bolt Driver chucks into any drill to make tightening of these bolts faster and easier, perfect for DIY and professional jobs. It works with any size wing nut or eye/hook bolt. The #18Flat Driver Bit is designed for drills and impact drivers. It is ideal for driving sidewalk bolts, security bolts, slotted bolts, window-security bars, and more and is built from Pro-grade S2 steel for durability. This set includes 2-pieces.