The Lenox 30888-VB11 Vari-Bit Step Drill Bit - 7/8" and 1-1/8" for 1/2" and 3/4" Conduit has a patented two flute design which cuts fast, clean, round holes that are accurate and burr-free. The enhanced flute design also removes chips rapidly to ensure longer tool life. The split point on the tip of the Vari-Bit is designed for faster penetration and prevents walking. The steam oxide coating adds to the durability of the Vari-Bit Step Drill Bit. Use of Lenox PROTOOL LUBE recommended to extend tool life. Step Sizes: 7/8" and 1-1/8" (for 1/2 and 3/4 conduit).