[alloy steel customized-Magnetism has been upgraded again]:5PCS 1/4inch Strong Magnetic Extension Bit Holder, 1PC Ph2 Impact Tough Screwdriving Insert Bits,1PC Precision Demagnetizer-Magnetizer. [Brand new process]:Newly upgraded, scientifically customized, and carefully improved.Strong Magnetic Extension Bit Holder is made of high-quality S2 Steel ,and the sleeve is made of high-quality alloy steel.The magnetism is enhanced and the loss of magnetic force is reduced.The rotation is stable and does not shake, so you can use it with confidence. [Strong magnetic]:The drill seat has permanent magnets to a secure fit of the drill seat. With strong magnetic, good adsorption, hold the drill bit and fasteners tightly, there is no trouble of dropping tools during the work.Magnetic force 10N. [Precision design]:Designed for 1/4inch hex shank bits.Great for working with hard to reach screws.Strong magnet holds bits securely, and the magnet is located inside the zinc alloy steel tube.Must-have accessory set for power drills and impact drivers. [Widely used]:Corrosion resistance,wear-resistant, high-strength, durable,hard.Suitable for all kinds of quick-change chucks and hex tools, it is a good helper for daily tool use.To a large extent, it can meet the needs of daily work.Unlimited uses in automotive, hardware, hobby, home, etc. Colour:Photo Color Material:alloy steel Package Contents: 5 x 1/4inch Magnetic Extension Bit Holder(60mm) 1 x Ph2 Impact Tough Screwdriving Insert Bits(50mm) 1 x Precision Demagnetizer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.