【Black & Gold Finish】 - Black and gold coating helps to generate less friction and provides longer life. 【135° Split Points】 - The 135 degree split point design reduces walking and allows easier hole starting. Three flats on shank eliminate bit spinning in chuck. 【Faster Cutting and Longer Life】- Drill bit with proprietary parabolic flute clears chips and debris to reduce heat buildup. Jefe Hex drill bit also features an ENHANCED TAPERED WEB that greatly increases strength and reduces premature breakage. 【Professional Grade】 - Designed for contractors, electricians and other professionals needing accurate and reliable bits on the job site. Drill bit set ideal for use in Steel/Copper/Aluminum/Zinc Alloy/Wood/Plastics. Also suitable for DIY projects/home maintenance/woodworking use. 【Package & Size】- 13 pcs jobber length drill bits set includes sizes: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4". 135-degree split point, 3-flat shank. Packaged in a double blister pack with easy opening design.