Hello, Please see sizing below. Small/Medium Medium Large 48-57cm / 19-22.5in 55-61.5cm / 22-24in

Is this ansi and or osha approved?

Not sure about ANSI or OSHA. Best bet is to contact Black Diamond directly and ask if the compliances met already on the helmet encompass the ones you are asking about. Here is what the instruction manual indicates: EN 12492: This number indicates that this helmet conforms to EN 12492:2012, the European Standard for “Mountaineering equipment – Helmets for mountaineers – Safety requirements and test methods.” UIAA: The presence of the UIAA Label indicates that the helmet has been tested according to UIAA 106 and awarded the UIAA Safety Label. : The CE mark of conformity indicates fulfillment of the requirements of the Personal Protective Equipment Directive (89/686/EEC) or Personal Protective Equipment Regulation (EU 2016/425). The Declaration of Conformity for this product may be viewed at http://blackdiamondequipment.com/DOC

How well would this helmet protect against falling rocks from above? Is it as strong as an industrial hard hat?

Compared to a hard hat, I’d think this helmet offers more protection. Of course, its safety depends upon the size of the rocks and the distance it falls.

Is it possible to separate the plastic from the hardware/foam in order to change out the shell color or paint the shell?

The components of this helmet are not meant to be separated (with the exception of the foam comfort padding), and we cannot recommend any modifications to protective equipment.

Age Range	Adult
Color	Denim
Size	M-L
Style	safety
Team	NotApplicable
Material Composition	- Material: EPS (Expanded Polystyrene), Polycarbonat
Height	6 inches
Length	11 inches
Weight	1 Pounds
Width	9 inches
Material Type	Plastic
Number of Items	1
Outer Material	Acrylonitrile Butadiene Styrene (ABS)
Season	Year-round
Features	Adjustable,Lightweight
Usage	Climbing Bouldering Canyoneering Backcountry Climbing, Outdoor
Sport	Climbing
Included Components	Black Diamond Half Dome Rock Climbing Helmet, Denim, Medium/Large
Batteries Included?	No
Brand	Black Diamond
Department	unisex-adult
Manufacturer	Black Diamond
Item model number	Black Diamond
Product Dimensions	35 x 30 x 15.01 cm; 354 g
ASIN	B07KXYCKY2

Half dome helmet

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