TH-1 Top Hats 35mm Aluminium Die Cast Top Hat Available in 90mm and 68mm versions, with or without OHM logo. Size Small, Ø105 mm (dia) x 68 mm (h) Standard, Ø105 mm (dia) x 90 mm (h) Cutout Hole Size Ø106 mm (dia), depth 5.2 mm Internal through hole min Ø57 mm (dia) View Drawing Click image to enlarge Download Drawing