The clear for electronics come with stainless steel screws and can be easily installed with a screwdriver. The screws are easy to tighten and stay level. Pre-drilled holes allow for a good installation, especially on hardwood. The for the cutting board are made of rubber material with patterns on the bottom to increase friction and have a good anti-slip effect. The anti-slip rubber furniture pads can fix all your furniture in place and protect the floors in your beautiful home from scratches. These cutting board feet bumpers help reduce friction, vibration, and noise when moving furniture. It also prevents the sofa from moving too fast when you are resting, or the chair from sliding too fast and scratching the floor. You receive 150 clear round and 150 stainless steel screws, which are enough to meet your daily use and replacement needs. Best for a variety of practical applications, can be installed on different custom cutting boards and other furniture. These nonslip cutting board feet are perfect for cutting boards, cheese boards, and the bottom of furniture such as cabinets, tables, sofas, and chairs. not scratch walls and floors. Also great for chassis instruments, machinery, and appliances.