Description:Equipped with self-tapping screws, drill bits and expansion tubes, this set is pretty practical and multipurpose, and with the dedicated storage box that has compartments, it is easy to store and carry.Adopting the choice material, each part of this set has excellent performance in rust-proof, corrosion and abrasion resistance, which is safe to use and has long service life.The making materials of this set include carbon steel, high speed steel, alloy and plastic.The length of the storage box is 15.5cm, the width is 10.5cm and the height of it is 3.3cm.This set is suitable for fixing blinds, shelves and so on.Item Name: Self-tapping Screw SetMaterial: Plastic,High Speed Steel,Alloy,Carbon SteelScrewdriver Bit Specifications: HP2Specification: 4mm, 5mm, 6mm, 8mm (Expansion Tubes, Screws)Shank Type: Hexagonal Shank (Bits)Size Details: 4mm Drill Bit Length: 75mm/2.95" (Approx.)5mm Drill Bit Length: 85mm/3.35" (Approx.)6mm Drill Bit Length: 100mm/3.94" (Approx.)8mm Drill Bit Length: 120mm/4.72" (Approx.)Bit Length: 50mm/1.97" (Approx.)Shank Diameter of Bit: 6.35mm/0.25" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.Package Includes:12 x Drill Bits (4mm x 3, 5mm x 3, 6mm x 3, 8mm x 3)40 x Expansion Tubes (4mm x 10, 5mm x 10, 6mm x 10, 8mm x 10)40 x Screws (4mm x 10, 5mm x 10, 6mm x 10, 8mm x 10)2 x Bits (HP2)