The clasp is made of stainless steel. Mounting board is made of aluminum die-casting alloy. The site of screw hole should be noticed when using with wall mount bracket. Load capacity of pole should be more than 3 times the weight of camera andb racket. Load capacity of clamp is 10KG. It can be used with some wall mount bracket. Diameter of clamp: ?67mm-127mm. Dimension 127x46x250mm.