regular polyhedron for angular measurements

{"cid":"91223678","title":"17 Sided Prism GCr15 Bearing Steel 17-20 mm Thickness","imgUrl":"https:\/\/img.ismap.com\/nimg\/41\/29\/97efcd37bb6c65d91956ad327c1d-200x200-1.jpg","attrs":{"Price":"3000~5000 USD","Brand Name":"SPR-ing","Minimum Order Quantity":"1 piece","Delivery Time":"1~3 weeks","Place of Origin":"Shenzhen","Payment Terms":"L\/C,T\/T","Supply Ability":"500\/month","Packaging Details":"Carton","Prism Thickness":"17-20 mm","Material Type":"GCr15 Bearing Steel","Rotating Center Aperture":"\u03c625 mm","Datum Plane Flatness Grade 0 (Grade II)":"\u2264 1 \u03bcm","Working Surface Roughness":"Ra \u2264 0.025 \u03bcm","Transparency":"Transparent","Material":"Glass","Working Surface Flatness Grade 0 (Grade II)":"\u2264 0.03 \u03bcm"}}