Feature: 1. Strong Penetration: 5 speed adjustable force with strong penetration, labor-saving and convenient to use. Different gear the power effect is obviously different. It can be adjusted according to different construction strength requirements. 2. Thickened Wear Resistant Noise Reduction Cover: silence and noise reduction, low noise during operation. The thickened steel noise reduction cover will reduce noise, safer, and more comfortable building environments without disturbing family or neighbors. 3. Automatic Slag Discharge Hole: with high hardness, thickened and sturdy, which automatically eliminates heat, for safety performance. 4. Ergonomic Handle: ergonomically designed anti slip handle for comfortable grip, effective oil and slip resistant. 5. Not Easy to Get Stuck: this machine uses alloy needles, which are not easy to get stuck even after continuous nailing. 6. Sturdy: This concrete nail fastening tool. It is made of steel, ensuring it can withstand heavy use and deliver consistent results. 7. Easy Operate: Just push and release, concrete nails fastening tool only takes a second to work, and a top can be easily nailed, no electricity required. 8. Small and Portable: This nails fastening tool is small and light, and can be used with one hand. Equipped with plastic box, easy to carry. 9. Widely Applications: Suitable for fixed anti theft windows, meter boxes, ventilation ducts, water ducts, etc. Specification: Specifications: Material: ABS Item Size: 31 * 12 * 4.5cm / 12.20 * 4.72 * 1.77in Item Weight: 600g / 1.32lb Package Weight: 3106g / 6.84lb Package Size: 53 * 24 * 9.5cm / 20.86 * 9.44 * 3.74in Package List: Package List: 1 * Nail Fastening Tool 1 * Machine Needle Assembly 5 * Extension Tube 1 * Reset Spring 1 * Percussion Spring 1 * Mini Spring 1 * Hex Wrench 1 * Percussion Needle 2 * Pin 1 Pair * Protective Glasses 1 * Cleaning Brush 1 * Storage Case 1 * User Manual (English)