Our flag stops are specially made for the 2040 extrusion, like our fence system and other extrusions, which have a 6mm slot size (typical in the UK and EU) for USA users who use an extrusion from 8020 Inc. The flag stop allows easy set-up for repeat cuts and can be easily folded out of the way when not in use. Machined Aluminium with a 3mm Stainless Steel flag stop, supplied with a thumb knob and t-nut to fit our extrusion and others that have M6 slots. We recommend these stops for smaller-sized panels. If you are using heavier panels, we would recommend the following stops: our more solid micro flip stops, which can be found here You will receive 1 x M6 Thumbscrew1 x Blue Aluminium Anodised Body1 x Flag - 3mm Stainless Steel1 x M6 Nyloc Nut2 x M6 WashersProudly made in Britain by Benchdog Tools 🇬🇧