Screwdrivers, nut drivers, and keys are used to tighten and loosen fasteners. Screwdrivers are for turning screws while nut drivers are used on nuts and bolts. Hex keys are used to turn bolts and screws with a hexagonal-shaped indentation in the fastener head. Torx keys are used to turn screws and bolts with a six-point star-shaped indentation. Service keys are used to turn fittings and fasteners and are compatible with one type of product or brand to limit tampering.

Nut drivers are used to manually tighten and loosen nuts and bolts for low torque applications such as appliance repair, automotive repair, and electronics assembly. They come with attached sockets that fit around and grip the entire head of the fastener for a secure fit. The nut driver sets provide multiple tools for use with a range of fastener head sizes.

Screwdrivers are used for installing (tightening) and removing (loosening) screws. Multi-bit screwdrivers come with multiple tip sizes and styles that eliminate the need to carry a set of screwdrivers with separate head types and sizes. Screwdriver sets provide an assortment of tools to tighten and loosen a range of fastener head types and sizes. Torque screwdrivers tighten screws to a specific torque to avoid overtightening or under-tightening screws.

Hex keys are used to turn bolts and screws with a hexagonal (six-sided) indentation in the fastener head compared to Torx keys that are used to turn screws and bolts with a six-point, star-shaped indentation. Service keys are used to turn fittings and fasteners and are compatible with one type of product or brand to limit tampering. Key organizers are used to holding multiple hexes or Torx keys and arrange the tools by size to ease identification and access.