About this product: ? [Product size]: 100mm*28mm. Install a 9mm threaded hole. robust and durable. Suit for universal bicycle, road bike, mountain bike, track bike, MTB, BMX, etc. ? [High Quality Material]: Made of high quality aluminum alloy, high strength and wear resistant. ? [Easy to install]: Able to be easily installed on the axles of the front or rear wheels of the bicycle, which can make your legs more comfortable and relaxing. ? [Non-slip design]: Diamond-shaped twill non-slip design, increase friction to ensure safety. No need to worry about accidental dropping. ? [Installation]: Mounted on the rear axle of the bicycle to ensure that the shaft protrudes 0.5cm. If it is too short, it is not installed or loaded is not solid. Product Protect the feet of adults or children against bicycle wheels. It is made of high quality aluminum alloy, high hardness and sturdy. Product Name: Bicycle Nail. Material: high quality aluminum alloy. Quantity: 2 pieces (1 pair). Size: 100mm*28mm, thickness: 3cm. Threaded hole diameter: 9 mm. Load bearing: 100kg (200lb). Applicable models: BMX show BMX / mountain bike / common car