This Set of Four Replacement Round Handle Bolts With Knobs is a must-have for every lawn mower enthusiast. The bolts are designed to fit universally on push lawn mowers and make it easy to replace old or worn out bolts. The sturdy plastic material ensures durability and long-lasting use. The item diameter and horsepower can be seen in the description, and the unit comes with four bolts in one pack. The black color adds to the sleek look of your lawn mower. This unit is manually powered and is perfect for those who prefer a traditional style lawn mower.