Bolts secure material by applying pressure from the head of the bolt. They fit with corresponding tapped holes and nuts to create bolted joints. Cap screws and hex bolts have heads designed for tightening to exact specifications with ratchets or spanner torque wrenches. Bolts with rounded heads, such as carriage bolts and step bolts, provide a low-profile fit in tight applications. Eye bolts have heads with large, round openings that can connect with hooks or other fasteners for specialty applications such as vertical lifting.