I used this once with an 8-foot aluminum stepladder for high-up work, and it's been sitting in the warehouse ever since. Thank you! This is a set of 4 safety stoppers that can be attached to a stepladder and used at a 75-degree angle, with a maximum load capacity of 100kg. - Maximum Load Capacity: 100kg - Angle of Use: 75 degrees - Number of Parts: 4 - Color: Blue - Material: Metal Thank you for looking.