1. Zinc plated for rust resistance, high hardness, can drill and fasten on thin steel sheets directly. Packed in small blister packs, ideal for retail sale and DIY home use. 2. Hex flange head provides stable force and anti-slip performance, widely used for fixing color steel, doors, windows and light steel. Small packs are lightweight and easy for shop display. 3. Built-in drill point, no pre-drilling required to save working time. Separate small packs with proper quantity, prevent screws from scattering and support flexible purchase.