The No. 223 is a ¹/₈” solid carbide drill bit to create for ¹/₈” holes in concrete suitable for fastening our No. 078, No. 580, or No. 780 aluminum drives. Each bit includes two usable ends. This drill bit requires a No. 225 ¹/₈” Hexagon Adaptor to adapt it to the chuck of a drill. Drill RPM must be maintained between 1700 to 3500 RPM. Length: 1 ⁷/₁₆“.