- Specifications: The automatic grain set includes 3 pieces of 5-inch (approx. 13 cm) grains: 1 model with cap and 2 base models without cap. It also comes with 3 high-quality steel replacement needles (4.6 x 0.6 x 0.6 cm). - Durable Materials: Constructed from robust alloy steel, this spring center set is both rust-resistant and wear-resistant. The chrome-plated stamp tip offers exceptional durability, lasting up to five times longer than standard needles. - Versatile Functionality: This grain metal set is ideal for diverse applications. Use the center punch for precise marking and pre-drilling on metal, wood, glass, and plastic. The adjustable impact force allows you to tailor the intensity of each stroke for accurate markings. Additionally, it serves as an emergency tool for breaking car windows in case of an accident, facilitating a quick escape. - User-Friendly Design: Operate the automatic grain set with one hand, eliminating the need for a hammer. Simply press the cap to make precise markings on various surfaces. Its compact and lightweight design ensures easy portability. The ergonomic stainless steel handle features a non-slip knurled pattern for a secure grip, enhancing comfort during use. Use Cases: 1. Marking and drilling holes in metal or wood for DIY projects. 2. Precise engraving on glass for personalized gifts. 3. Emergency tool to break car windows in critical situations.