Safety Helmet Hard Hat Construction Engineer Working Protective PE knob Cap Adjustable Twist Durable Thickened dust and sun protection Emergency Head Gear Protective Equipment

Standard Safety Hard Hat With Twist Adjuster  Ideal for adult Adjustable nape strap suspension holds hat securely in place Lightweight and balanced for all-day wear Made of a durable polyethylene shell Adjust the size quickly and easily head circumference adjustment range: 520-650MM Style: hard hat（Knob type） Color: blue, red Features: lightweight, high strength, good toughness, cold resistance etc, button to adjust the hat easily by single hand Application: construction, transportation, mining, electricity, metallurgy, petroleum and shipping etc