[High Quality Carbon Steel] R clips retaining pins are made of high-quality carbon steel. Advanced Galvanizing Technology effectively prevents rust and surface without burr. The cotter pins suitable for indoor, outdoor working environment. [Strong Elastic Hairpin Design] Because of a metal composition and consummate casting skill, the hitch pin clips have high hardness and strong spring tension. The pin will not be removed when the clip is in place. Furthermore, once these are in place they last. Hairpin design: fast, Safe and effective locking bolt, uniform force, not easy to , relative travel, will not fall off, easy installation and disassembly, reusable. [Sturdy and Handy] Great clips,heavy weight enough. Even when you suspend a heavy RV by these, they 't shear or break, no matter how much they are pulled, yanked, twisted, or jerked. For tow bar and for other equipment around our farm. Perfect for lawn mower tire or riding mower and carts. [Perfect cotter pin replacement] Replacing hitch pins on most equipment that came with weaker pins, essential for trailer ball pins, pins,keeper pins, retainer pins hitch,hand truck pin replacement,tractor cotter pins,trailer pin clips,hand truck pin replacement. Applicable to all kinds of machinery, , farm equipment, engines, trucks, cars, -, lawn and garden equipment, etc. You can upgrade all your tractor and truck hitches. Product Type:Fasteners Product composition: - 35Pcs M1.2x21 - 20Pcs M1.5x28 - 10Pcs M1.8x37 - 5Pcs M3x12 - 5Pcs M3x16 - 5Pcs M4x12 - 5Pcs M4x16 - 5Pcs M5x12 - 5Pcs M5x16 - 5Pcs Scope of application: pin shaft with flat head is suitable for various mechanical equipment, such as automobiles, machine tools, molds, ships, etc. Note:the color ofthe plastic box is random,no designation is accepted Colour:Silver Material:carbon steel Package Contents: 1 * spring pin set 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.