These longer length high speed steel drill bits can reach into areas that are difficult to access with standard length drill bits. Model G9750 includes 1/16" - 1/4" by 64ths X 6" long. Model G9751 includes 1/16" - 1/2" by 64ths X 12" long. Model G9752 includes 1 - 60 wire gauge sizes X 6" long.