This is a track and field shoe spikes, you can install the spikes on the sole of the shoe, widely used in track and field sports, plastic track, sand, hurdles, etc.It is suitable for very loose sand and land-runway, and can have the effect of pushing off the ground.Specification：Color: SilverMaterial: SteelOverall Length: 18 mm/ 0.7 inchSpike Length: 12mm /0.47 inchThread Length: 4.6mm/ 0.18 inchThread Diameter: 5 mm/ 0.19 inchSpikes Wrench Size: 76 x 49 x 14 mm/ 2.9 x 1.9 x 0.5(L x W x H)Packing List: 50 x Track Spikes and 1 x Spike Wrench with 1 x Carry BoxAdvantage:1. The spike is made of steel, which is strong and durable, wear-resistant, anti-corrosion and anti-rust. The spikes are specially designed to provide grip on dry terrain for track and field, cross-country roads, hiking, high jumping or cross-country.2.