This is a triple brake (non-hydraulic) & gear cable stop designed for use on a bamboo, wooden or carbon fibre bicycle where fittings such as these need to be glued and screwed on, rather than welded. This cable stop has two countersunk (5mm diameter heads) screw holes with 3mm diameter to allow for a M3 screw to be used to affix to the bicycle frame. The bottom of this cable stop is curved for tubing 35mm in diameter, so it's suitable for use on top-tubes. See my other smaller diameter designs for use on seat and chain stays. Please note, these have not been tested to any safety standards. Buyers use these at their own risk.