Zfdrill Y-grade friction drill bit - suitable for 0.7-2.5mm iron and 0.7-1mm stainless steel, not easy to break, good balance and wear resistance. Specifications M3 M4 M5 M6 M8 10 M12 M14 M16 M18 M20 G1/8 G1/4 G3/8 G1/2 G3/4 G1 and other specifications are in stock and can be customized, suitable for bench drills and other low-precision equipment operations.