I have not been able to determine what equipment these collets come from. They have a feature - the groove preventing rotation is located in the front part (on the skirt). The total length of the collet is 114 mm. See last photo for other dimensions.
This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Chucks\Collet Chucks". The seller is "disk_rim" and is located in this country: UA. This item can be shipped worldwide.