CLAMP is the most important fitting for any type of gutter. The stronger the clamp, better the life of the gutter. Also clamping styles differ from type of roofs. There are two types of clamps for MAX Gutters. 1. uPVC clamp with GI handle and 2. GI clamp. GI clamp and uPVC clamp with GI handle can be used for welding to metal surfaces. Slope must be provided when installing the clamps to enable flow. It locks the gutter inside the clip which prevents the edges from flipping out.