The locking tube pins are very useful accessories in daily life, they are used to lock round and square pipes. For quick release, telescopic, folding, etc. Commonly used for camping tents, rowing, boating, sailing, fishing poles, umbrellas, caravans, fitness equipment, photographic equipment, shopping carts, etc.Specification:Color: SilverMaterial: Manganese SteelBody Size: 36 x10 x 0.5 mm/1.42 x 0.39 x 0.02 inch (L*W*T)Push Buttons Size: 8.3 x 8 mm/0.33 x 0.31 inch (L*Dia)Packing List: 8 x Spring ClipsAdvantage:Made of manganese steel and with a nickel-plated surface, it is flexible, has long-lasting elasticity, not easy to break and rust.It is hardened by a superb heat treatment process, making it more wear-resistant, sturdy, and durable for long service life.