Flexible shaft can bend up to 300 degrees. Mount a hex driver or cordless drill shank diameter: 6.35 mm (1/4 in.) bits and bit holder keeps bolts secure while driving Flexible, shield protects your hand while the shaft spins. Bends, Twists and Makes Drill Bit for Use in Tight and Confined Spaces It can be used for cartridge type hand or power drill screwdriver. Mainly used in computer chassis space, electrical cabinets, furniture, electrical appliances and other narrow screwdriver may not work in environment Metal materials, durable and portable, flexible, shield protects your hand while the shaft rotates the flexible shield protects your hand while the inner shaft rotates Description: This flexible shaft can be used for a drill without ordinary screw thread, it can also be used for electric screwdriver. Flexible rod heads can be mounted on screwdriver bits with hex shank (1/4 shank), mainly used in computer cases, electrical cabinets, furniture, electrical appliances and other narrow spaces where screwdrivers do not cannot work normally. Specifications: Material: metal Hexagonal shank: 6.35mm (1/4") Inner hex head: 6.35mm (1/4") Total Length: 200mm quantity: 1 Package includes: 1 x Flexible Shaft Extension Drill Holder Note: 1. Please allow 1-3mm error due to manual measurement. Thank you for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.