Amazon.com Product Description: You can count on DEWALT to produce top quality cut-out tool bits, designed for reliable results in a broad range of jobs. The DEWALT 1/8-inch general purpose bit is designed with 1/4-inch shank for increased endurance and specially designed flute for added productivity in driving applications. Make sure you use the correct bit for your application.
DEWALT DW6601 1/8 Inch General Purpose Bit (5 pack)
Worked great on drywall...not so great on anything else I tried to cut out. General Purpose should be drywall only...1/8 is not that big and they tend to easily break as can be expected by the size of the shaft.