Title: 21/26 Inch Full-Steel Spring Telescopic Stick | 4142 Alloy Steel with Window-Breaker Bullet Points: 1. Military-Grade Material: Entire body crafted from 4142 alloy steel with quenching process for unbeatable durability and impact resistance; small/medium/large tubes all share the same premium material, pipe diameters 11.5mm/16.5mm/25mm for balanced rigidity. 2. Precision Locking System: Spring mechanical locking structure ensures zero slip or failure during use; one-click pop-up design for instant deployment when you need it most. 3. Dual Size Options: 21inch model (525g, 24cm closed/52.5cm unfolded) for everyday carry; 26inch model (650g, 29cm closed/65.5cm unfolded) for heavy-duty outdoor scenarios. 4. Practical Ergonomic Design: Six-sided rubber handle for non-slip grip even in wet conditions; built-in stainless steel pen clip for easy clipping to bags/belts; tail window-breaking tip doubles as emergency rescue tool, compatible with tail ropes for added security. 5. Factory Direct Quality: Rigorously tested for locking stability, no jamming or misalignment issues; ideal for hikers, campers, and personal safety enthusiasts.