This premium drill bit set includes 29 jobber lengths, black and gold, 135 deg. Split Point bits. Manufactured from Hi-Molybdenum steel and Nitro-Carburized, sizes range from 1/16" - 1/2 by 64ths. Body and clearance areas are treated gold-surfaced for maximum lubricity and toughness. These bits are recommended for use with hardening grades of stainless steel and other hard metal drilling applications. Manufactured to NAS 907B aerospace specifications, they will substantially outperform cobalt options. Individual drill bit part numbers follow this numbering sequence; KTI71241 is 1/16", KTI71242 is 5/64", KTI71243 is 3/32"...... KTI71267 is 15/32", KTI71268 is 31/64", KTI71269 is 1/2". AMCO Auto Parts, LLC has been striving to supply and support car enthusiasts around the world with the prod.