Doughty G116001 Supaclamp black, Supaclamp will clamp onto round poles up to 50mm and flat surfaces up, to 35mm thick. Doughty engineering manufacture a range of spigots that snap into the supaclamp to hold, lights etc., Grips: 5mm flat to 50mm diameter, Weight: 0.45 Kg, SWL: 20 Kg