Product name: 21" spring stick English manual available Size: 21inch Weight: 525g Closed size: 24cm, unfolded size: 52.5cm Material: Small tube: 4142 alloy steel; Medium tube: 4142 alloy steel; Large tube: 4142 alloy steel. Pipe diameter: small pipe 11.5mm, medium pipe 16.5mm, large pipe 25mm Locking structure: spring mechanical locking Handle: Fire Rubber Handle Product features: All-steel material with quenching process, stainless steel portable pen clip, one-click pop-up, locking Stable performance with no locking issues.The tail has a window-breaking function and can be equipped with a tail rope. Box size: 43*25*22cm, one box contains 50 pieces, weight: approximately 32kg