Gravity GR-GWB123B Round Cast Iron Base for M20 PolesThis flat, heavy round base made of cast iron accepts extension tubes with an M20 screw thread and ensures a secure footing with a weight of 9 kg. For increased stability, a 5 kg weight disc is available as an accessory (item no. GWB123WPB), which is easily assembled without tools. VARI WEIGHT patented stability system for secure holding and simple transportation by means of an insertable weight disc. Product type Stands and Tripod Accessories Type