These brass zerk fittings are essential accessories for industrial casters and wheels. Designed with a M5 metric male thread, they allow for easy lubrication and maintenance of your equipment. The solid brass construction ensures durability and resistance to corrosion. Keep your machinery running smoothly by incorporating these grease fittings into your maintenance routine. With their compact size, they can fit into tight spaces, making lubrication a breeze. Upgrade your equipment with these high-quality zerk fittings today.