We offer the finest quality masonary drill bits to get the job done right. These drill bits are hand picked by our experts to work for this job and with our alignemnt tool. It is a 5/8" Masonary Drill Bit that is 18" in length. Any drill bit used with the alignment tool must be at least 18" in length and be a 1/2 inch chuck. Available in both SDS (snap-in) and standerd chuck. The bit provided with our drill/drill bit rental is a SDS. SDS are generally used by Bosch and the bit you would be purchasing on our site is a genuine Bosch bit. The standard bit is for drills where you use a chuck key to tighten the chuck around the bit.