Size: 10pcs M3x20mm, 10pcs M4x20mm, 10pcs M5x20mm, 10pcs M6x20mm, 10pcs M8x20mm. Total 50pcs butterfly wing screws. Material: These wing bolts are made of 304 stainless steel.More durable, non-toxic and corrosion resistant.High hardness and not easy to deform.Can be used in outdoor humid environments. Design: Butterfly design of the hand twist screws will increase the lateral bearing surface and makes it easier to fasten. Feature: These butterfly wing nuts are very easy to install and remove.Twist it by hand without any other tools. Can be used repeatedly.5 common sizes, enough to meet your daily use. Applications: These butterfly bolt screws can be used for many different common equipment, like Machinery and equipment, electronic equipment, hardware.
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