Made to order square mandrels. 1/2” x 1/2” x 2”.Made to be used with borosilicate glass and softglass.Made from 304 stainless steel thick walled tube and tig welded. These stand up better then store bought mandrels I guarantee it. My mandrels are being sold in a glass shop in Vancouver bc for the past 5yrs. For every 5 purchased you get 1 free.