A vice grip and a drill bit can form a 90 degree screwdriver, allowing you to secure screws in tight spaces that don't allow for a regular screwdriver. : r/lifehacks
90° CornerClamp™ - Milescraft
Corner Clamp,90 Degree Right Angle Clamps with 4inch Bar Clamps for Woodworking,Carpenter,Welding,Photo Framing Vise : Amazon.co.uk: DIY & Tools
Right Angle Clamp Single Handle 90 Degree Corner Clamp Vice Grip Welding Photo Frame Vise Holder