Adaptor hold wheels with 40mm ID. Brand is unknown, but has the Identification number 106.1204.01 and L15 degrees. Items is in good shape on all functional surfaces. Appears to hold wheels of 14-19mm thickness. OD of flange and nut are 90mm. Arbor height /thickness is 39mm. It has a tapered hole for spindle mount and adjustable balance weight in the back.