OKNIFE MBS1 4 mm Hex Bit Screwdriver Set, 9 pcs Durable S2 Tool Steel Double Ended Bit Set with Permanent Pen, Perfect for Opry, D1, U1 Pro Series and other 4 mm Hex nut drivers

• [High Quality S2 Tool Steel Construction] Each of the 4mm double-sided bits is made of premium S2 tool steel, known for its exceptional hardness and wear resistance. It has a durability that is higher than 99% of similar bits on the market. The nickel plated surface ensures superior durability and long-lasting performance, even in heavy use.
• [Versatile 9-piece bit set] The MBS1 set includes 9 different double-sided bits in different sizes (T1+△2.3; PH00+PH2; PH0+SL3.5; SL1,5+SL2; H2.5+H3; H1.5+H2; T10+T15; T7+T9; T6+T8), offers the perfect solution for different screw sizes. Perfect for the Opry series, D1 series and U1 Pro series tools, compatible with other 4mm hex nut drivers.
• 【Eternal pen for enhanced functionality】 Unlike regular bit sets, the MBS1 includes a high-quality eternal pen made from special materials. This pen is reusable, requires no sanding and extends the set's utility for writing tasks or labelling during work.
• [Safe and portable design] Each piece is securely held in place with TPR rubber sleeves, preventing unnecessary movement or loss. The set also has a hanging hole for easy storage and convenient portability, ensuring that your bits are always within reach.
• [Durable and portable] Made of tough S2 steel, OKNIFE MBS1 set bits for easy attachment and secure storage. With a versatile range of sizes and a bonus everlasting pen, it is perfect for professionals and DIYers. The set comes in an elegant frosted pouch and a convenient toothpaste-style box for easy storage and portability.

The OKNIFE MBS1 9 PCS Bit Set is designed for durability and precision. Made from premium S2 tool steel, the 4mm double-ended bits are nickel-plated for corrosion resistance and long-lasting performance. This versatile set includes 9 different bit sizes, ideal for Opry, D1, and U1 Pro series tools.In addition, the set features a reusable Eternal Pencil for easy marking and writing, plus TPR rubber sleeves to keep the bits secure and organized. The magnetic bits offer quick attachment and detachment, while the compact carry case ensures easy portability. Whether you’re a pro or DIY enthusiast, the OKNIFE MBS1 is your go-to bit set for any job.