what is the the diameter of the bar?

It’s in the description 1 inch diameter.

Can these be installed in a shower with a fiberglass enclosure compromising the enclosure

I see no reason they couldn't be installed through the fiberglass into the sold wall behind it especially if you can find the studs. The enclosed wall anchors that come with the grab bar are very good, very study large plastic ones. hope this helps.

How wide is the mounting bracket that screws onto the wall?

I am not home where it was installed it’s about 2 1/2 or 3 inches wide

where is the 12" bar measured from and to?

Hi Sir/Madam, The 12 inch safety bar is measured from the outside to outside of the cube, as you can see on the product photos. Any other questions pls feel free to contact us. BR, Seller ZUEXT

Zuext 12 Inch Polished Chrome Safety Grab Bar For Bathroom

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Description

🛁 Elevate your safety game with style and strength!

SLEEK SEAMLESS - Concealed mounting hides screws for a clean, modern bathroom aesthetic.
MULTI USE SUPPORT - Perfect for bathrooms, kitchens, stairways—ideal for seniors, pregnant women, and anyone needing extra grip.
ROCK SOLID SAFETY - Supports up to 500 lbs for unmatched stability and confidence.
PREMIUM DURABILITY - Crafted from rust-resistant stainless steel to last through daily use.
EFFORTLESS INSTALLATION - Includes screws, anchors, and a bonus adhesive hook for versatile mounting.

The ZUEXT 12 Inch Polished Chrome Safety Grab Bar combines heavy-duty stainless steel construction with a sleek, concealed mounting design. Engineered to support up to 500 lbs, it ensures reliable stability in bathrooms and beyond. Easy to install with included hardware and a bonus adhesive hook, this grab bar offers both safety and modern elegance for active, safety-conscious professionals.

Specifications

ASIN	B07CNNPBD6
Best Sellers Rank	#32,904 in Health & Household ( See Top 100 in Health & Household ) #32 in Bath & Shower Grab Bars
Brand	ZUEXT
Brand Name	ZUEXT
Color	Chrome
Customer Reviews	4.4 out of 5 stars 8,348 Reviews
Finish Types	Brushed
Included Components	12 inch chrome safety bars for showers and walls, bathroom handicap bar, bathroom support bars, elderly bars for bathroom, senior bathroom rail
Item Dimensions L x W	12"L x 1"W
Item Highlight	Stainless Steel Grab Bar Handle, Bathroom Balance Bar, Safety Hand Rail Support, Handicap Elderly Injury Seniors Assist
Item Weight	0.26 kg
Manufacturer	ZUEXT
Manufacturer Part Number	bath-bar-12in-steel-US
Material	12 inch bathroom grab bar, 12 inch shower grab bar chrome, 12 inch stainless steel grab bars for bathroom, Stainless Steel, bathroom handles shower, bathroom handrails for elderly, bathroom support handles, grab rails for elderly, handle for bathroom wall, polished chrome shower safety bars, rust resistant stainless steel grab bars, shower safety bars for seniors, stainless concealed screw grab bar, stainless steel handrail for shower 12 inch Material 12 inch bathroom grab bar, 12 inch shower grab bar chrome, 12 inch stainless steel grab bars for bathroom, Stainless Steel, bathroom handles shower, bathroom handrails for elderly, bathroom support handles, grab rails for elderly, handle for bathroom wall, polished chrome shower safety bars, rust resistant stainless steel grab bars, shower safety bars for seniors, stainless concealed screw grab bar, stainless steel handrail for shower 12 inch See more
Material Type	12 inch bathroom grab bar, 12 inch shower grab bar chrome, 12 inch stainless steel grab bars for bathroom, Stainless Steel, bathroom handles shower, bathroom handrails for elderly, bathroom support handles, grab rails for elderly, handle for bathroom wall, polished chrome shower safety bars, rust resistant stainless steel grab bars, shower safety bars for seniors, stainless concealed screw grab ba…
Model Number	bath-bar-12in-steel-US
Number of Items	1
Product Dimensions	12"L x 1"W
Style	12 Inch
Style Name	12 Inch
UPC	602668015893
Unit Count	12 Count
Weight Capacity	Maximum weight: 500 pounds

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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ZUEXT 12 Inch Polished Chrome Safety Grab Bar for Bathroom Shower Tub

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