What is the clamp diameter?

One of the "problems" with Amazon and almost any bicycle /tricycle part that is advertised for sale, that there are multiple independent Amazon vendors for the same manufacturer's products. Many of them don't do a great job of explaining critical technical details, such as, in this case, the diameter of the clamp.I think because, in many cases the vendors don't have the time to dig through each of the thousands of parts that they sell.And so they don't necessarily write identically worded titles and descriptions for the part that they are selling that is actually one of a family of identical parts except that they have a dimension difference. This is very common problem with many bike parts.It truth, this part comes in two sizes "Standard" and "Oversize"The "Standard" clamp fits 22-29 MM tubing.The "Oversize" clamp fits 27-35 MM tubing.It was on this particular accessory that I learned that lesson.What I do, is read each and every presentation of any cycling accessory and glean from them ultimately the manufacturer specifications. In some cases I will do a google search on the manufacturer, in thais case Minoura, from Japan. Then I will put together a search on Amazon based on the specific details of the part I need.Then it usually comes up.In your case, try a variety of similarly worded searches, and you will find one display of the product on Amazon that will have a pull down panel with "standard" and "oversize" as choices, so you can select the one you need.

Is the bar part metal or plastic?

Metal.. Is all metal with plastic end caps.

Would this mount on the stem, under the top cap or under the stem like a headset spacer?

Look at the Minoura CS-500 model this company offers - it's specifically made to mount the way you describe. But theoretically, you can use this if you're crafty enough (you'll need 1/4-1/2" of space on the stem and maybe a shim).

I have a Profile Design H2O OS Stem which is oval shaped. Will the LW Clamp mount to it, or is it only suitable for round, non aero bars and tubes?

I would say it will only work on round tubes. An oval tube would require shims, but there might not be enough working room inside the clamping arms to apply shims---it depends on the "diameter" of the oval tube. The curved clamping arms are made of thick aluminum, so bending them to fit an oval shape would be very diffcult and might break them. The only other solution is to file the oval stem into a round shape, which might be "sacreligious." This problem is another argument for the standardization of bicycle parts.

Item Package Dimensions L x W x H	7.8 x 4.02 x 1.18 inches
Package Weight	2.88 ounces
Item Dimensions LxWxH	7.75 x 5.5 x 2 inches
Item Weight	0.01 Ounces
Brand Name	Minoura
Warranty Description	Limited Warranty
Model Name	Mi060swg4
Color	Black
Material	Aluminum
Suggested Users	unisex-adult
Number of Items	1
Manufacturer	Cycle Force Group
Part Number	339-1993-01
Model Year	2012
Style	Swg-400 Stem
Included Components	User manual
Size	28-35mm
Sport Type	Cycling

Minoura Accessory Holder with Angle Adjustable LW-Clamp for Up 2 Devices, Black

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