1、21-piece set includes 2 * bendable drill bit extensions, 1 * 105° angle bit extension, 3 universal socket adapters(1/2\", 3/8\", 1/4\"), 3 * drill bit holders, 1 * 10pcs screwdriver bit kit, 1 * socket grip and 1 * wrench power drill adapter. 2、105° angle bit extension can be attached to electric drills, cordless drills or hand wrenches, allowing them to extend into inaccessible stenosis for twisting screws, nuts and more. 3、1/2\", 3/8\", 1/4\" universal socket adapters can be used on electric screwdrivers, pneumatic screwdrivers, pneumatic drills, manual screwdrivers and other installation for the hexagonal tools. 4、Bendable drill bit expansion can be twisted and rotated at different angles. It can drill into small spaces and various crevices without requiring you to manually perform flexible installation works. 5、This kit is compatible with small wrenches, cordless screwdrivers, low-speed hand drills, pneumatic screwdrivers, torque drills, electric screwdrivers, and is mainly used in computers chassis, electrical cabinets, furniture, appliances, other narrow space screwdrivers, etc. Item Type: Flexible Drill Bit Extension Set Material: Carbon Steel + Aluminum Alloy + Steel + 40CR Steel + Plastics 2 x Bendable Drill Bit Extension 1 x 105° Angle Drill Bit Extension 3 x Universal Socket Adapter(1/2in, 3/8in, 1/4in) 3 x Drill Bit Holder 10 x Screwdriver Bit 1 x Socket Grip 1 x Wrench Power Drill Adapter