Use: External corners with use of 40mm, 50mm or 50.8mm profiles Clamp length: for use with 1.5 x 1.5" up to 3 x 3" timbers Bar thread length: 80mm - with RHINOGRIP thumbscrew to allow clamp to be securely fixed to profile and timbers Material: Zinc plated steel for superior corrosion resistance Designed and manufactured in Britain using only the highest quality materials, our range of bricklaying tools are made to last.