1. Specification: 100 Piece screwdriver bit set consists of (8) Phillips, (8) Pozi drive, (9) Slotted flat, (9) Torx star, (9) Tamper proof Torx star, (9) Metric Hex, (6) Tamper proof Metric Hex, (10) SAE Hex, (6) Tamper proof SAE Hex, (4) Square, (4) Spanner, (3) Torq, (4) Tri-Wing, (3) Clutch, (3) XZN Spline, (1) Wing nut driver, (1) Magnetic bit holder, (2) Socket adapters, (1) Bit adaptor 2. Quality Material: The screwdriver socket head is made of Cr-V alloy steel, which is strong and has good toughness, not easy to break, for ultimate longevity. It is the best material for making a bit of a set. The chamfering design of the head increases the contact area, is not easy to wear, and is more durable 3. Convenient Storage: Equipped with a special storage tool box, easy to carry. Each drill slot is engraved with the correct dimensions for quick identification and avoids clutter. Help you to store the bits faster and better, Save your time 4. Wide Usage: The magnetic extension bit holder can absorb the bit more firmly and prevent it from falling during use. Quick-release allows quick change of bit size. Can be used for a manual electric screwdriver, screwdriver, drill, air, and other tools. Perfect for DIY projects, with professional results. Use for household maintenance and repair, and so much more