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Q:Why are these products cheaper than similar products?Good quality? A: Our products are manufactured with high quality chromium vanadium steel,never rust, and hard.Chrome vanadium steel suitable for heavy duty impact drivers. Spring loaded ball bearing on head holds sockets securely.let your save time and effort at a reasonable price. Q:Will it break?What kind of warranty comes with the bit Adapters? A:Will never break, service life: hundreds of thousands of times.Guarantee100% money back or resend you a new set for any product problems . Q: Will they hold up under the stresses of constant impact & torque? A: yes,he will!but ... All Tools will break,No matter how strong or what they're made of.Product Description: Material: Chrome vanadium steel CR-V Shank Diameter: 1/4 '' (6.35mm) Size x Length: 1 x 4/1(L:25mm) 1 x 4/1(L:30mm) 1 x 4/1(L:50mm) 1 x 4/1(L:65mm) 1 x 2/1(L:50mm) 1 x 2/1(L:73mm) 1 x 8/3(L:50mm) 1 x 8/3(L:65mm) Package List 8pcs Drill Nut Driver Power Extension Bar