FR4200X250/3500 is a partial letter drill bit manufactured by Bungard. It features a ground twist drill bit made from high quality HSS (High Speed Steel) material, which ensures long-lasting performance and durability. This partial drill bit is designed for drilling stones, concrete and other hard rocks, as well as metal material such as stainless steel. It also features a straight shank and a 140° point for easier positioning and extra strength in hard materials. Lastly, its 3500 RPM performance makes it suitable for more challenging drilling applications.